Digital marketing became more sophisticated in the 2000s and the 2010s, when[13][14] the proliferation of devices' capable of accessing digital media led to sudden growth.[15] Statistics produced in 2012 and 2013 showed that digital marketing was still growing.[16][17] With the development of social media in the 2000s, such as LinkedIn, Facebook, Youtube and Twitter, consumers became highly dependent on digital electronics in daily lives. Therefore, they expected a seamless user experience across different channels for searching product's information. The change of customer behavior improved the diversification of marketing technology.[18]
Display advertising - As the term infers, Online Display Advertisement deals with showcasing promotional messages or ideas to the consumer on the internet. This includes a wide range of advertisements like advertising blogs, networks, interstitial ads, contextual data, ads on the search engines, classified or dynamic advertisement etc. The method can target specific audience tuning in from different types of locals to view a particular advertisement, the variations can be found as the most productive element of this method.
Relative to other marketing mediums, pay-per-click marketing is still in its infancy with a very long, promising future. As you establish your own history with online marketing and expand your knowledgebase, remind yourself to be like Tony Montana (only the positive, inspirational qualities… ignore the rest). Be hungry, scrappy, and aggressive and work harder and smarter than your competitors. As Tony said “The World is Yours!”
6. Measurement and analysis. You won’t get far in SEO unless you know how to measure your results, interpret those results, and use your analysis to make meaningful changes to your approach. The best tool for the job is still Google Analytics, especially if you’re new to the game. Spend some time experimenting with different metrics and reports, and read up on Analytics knowledge base articles. There’s a deep world to dive into.
[41] Katja Mayer views PageRank as a social network as it connects differing viewpoints and thoughts in a single place. People go to PageRank for information and are flooded with citations of other authors who also have an opinion on the topic. This creates a social aspect where everything can be discussed and collected to provoke thinking. There is a social relationship that exists between PageRank and the people who use it as it is constantly adapting and changing to the shifts in modern society. Viewing the relationship between PageRank and the individual through sociometry allows for an in-depth look at the connection that results.
When PageRank leaks from a site via a link to another site, all the pages in the internal link structure are affected. (This doesn’t always show after just 1 iteration). The page that you link out from makes a difference to which pages suffer the most loss. Without a program to perform the calculations on specific link structures, it is difficult to decide on the right page to link out from, but the generalization is to link from the one with the lowest PageRank.
The criteria and metrics can be classified according to its type and time span. Regarding the type, we can either evaluate these campaigns "Quantitatively" or "Qualitatively". Quantitative metrics may include "Sales Volume" and "Revenue Increase/Decrease". While qualitative metrics may include the enhanced "Brand awareness, image and health" as well as the "relationship with the customers".

Baseline ranking assessment. You need to understand where you are now in order to accurately assess your future rankings. Keep a simple Excel sheet to start the process. Check weekly to begin. As you get more comfortable, check every 30 to 45 days. You should see improvements in website traffic, a key indicator of progress for your keywords. Some optimizers will say that rankings are dead. Yes, traffic and conversions are more important, but we use rankings as an indicator.
I think Google will always be working to discern and deliver “quality, trustworthy” content and I think analyzing inbound links as endorsements is a solid tool the SE won’t be sunsetting anytime soon. Why would they? If the president of the United States links to your page that is undoubtedly an endorsement that tells Google you’re a legitimate trusted source. I know that is an extreme example, but I think it illustrates the principals of a linking-as-endorsement model well.

In the 2000s, with more and more Internet users and the birth of iPhone, customers started searching products and making decisions about their needs online first, instead of consulting a salesperson, which created a new problem for the marketing department of a company. In addition, a survey in 2000 in the United Kingdom found that most retailers had not registered their own domain address.[12]These problems made marketers find the digital ways for market development.
Google has a very large team of search quality raters that evaluate the quality of search results, that gets fed into a machine learning algorithm. Google’s search quality rater guidelines provide plenty of detail and examples of what Google class as high or low quality content and websites, and their emphasis on wanting to reward sites that clearly show their expertise, authority and trust (EAT).
Paid search functions as an auction. Advertisers bid on keywords that are relevant to their business that can trigger the display of their ads when users search for those terms. A wide range of factors determine where an ad will be shown on the SERP. Some ads might be displayed above the organic search results (such as the Lowe’s, Craftsman, and Husqvarna examples in the “lawnmowers” SERP example above), whereas others may be shown to the right of the organic results. Some advertisers choose to limit the display of their ads to mobile searches only, whereas others exclude mobile results altogether. Some ads feature extensions, and some do not.
In 2005, in a pilot study in Pakistan, Structural Deep Democracy, SD2[59][60] was used for leadership selection in a sustainable agriculture group called Contact Youth. SD2 uses PageRank for the processing of the transitive proxy votes, with the additional constraints of mandating at least two initial proxies per voter, and all voters are proxy candidates. More complex variants can be built on top of SD2, such as adding specialist proxies and direct votes for specific issues, but SD2 as the underlying umbrella system, mandates that generalist proxies should always be used.
With this, appearing in Google’s local pack is now more important than ever. In 2014, Mediative conducted an eye-tracking research studying where users look on Google’s SERP. The study showed that users often focus their attention near the top of the page, on the local search results, and the first organic search result. In addition to this, several studies have concluded that organic search listings receive more than 90% of the clicks, with users favoring local search results the most.

Every company with a website will have analytics, but many senior managers don't ensure that their teams make or have the time to review and act on them. Once a strategy enables you to get the basics right, then you can progress to continuous improvement of the key aspects like search marketing, site user experience, email and social media marketing. So that's our top 10 problems that can be avoided with a well thought-through strategy.


These are paid advertisements via Google AdWords. You can differentiate these from organic (non-paid, earned) results because of the tiny yellow “ad” icon. Normally, you will also see paid ads at the top of the SERP as well. In this book, we are only talking about SEO for organic search results, not advertising through search engines. But it is important to understand the difference as a user, and as a search engine optimizer, as they can both be valuable.
If we look at these other definitions of digital marketing such as this definition of digital marketing from SAS: What is Digital Marketing and Why does it matter? or this alternative definition of digital marketing from Wikipedia we can see that often there is a focus on promoting of products and services using digital media rather than a more holistic definition covering customer experiences, relationship development and stressing the importance of multichannel integration. So for us, the scope of the term should include activities across the customer lifecycle:

Our professional team is comprised of creative and skilled Web Developers who are experts at designing solutions that are both effective and economical. Whether you need a Logo Design for your new company, a custom Website Design, or assistance with designing a Web Marketing Campaign, Taylored Ideas has the experience to meet your needs. Not only will we work with your budget, but we will do it quickly and in a professional manner.
The mathematics of PageRank are entirely general and apply to any graph or network in any domain. Thus, PageRank is now regularly used in bibliometrics, social and information network analysis, and for link prediction and recommendation. It's even used for systems analysis of road networks, as well as biology, chemistry, neuroscience, and physics.[43]
With brands using the Internet space to reach their target customers; digital marketing has become a beneficial career option as well. At present, companies are more into hiring individuals familiar in implementing digital marketing strategies and this has led the stream to become a preferred choice amongst individuals inspiring institutes to come up and offer professional courses in Digital Marketing.
Pay-per-click is commonly associated with first-tier search engines (such as Google AdWords and Microsoft Bing Ads). With search engines, advertisers typically bid on keyword phrases relevant to their target market. In contrast, content sites commonly charge a fixed price per click rather than use a bidding system. PPC "display" advertisements, also known as "banner" ads, are shown on web sites with related content that have agreed to show ads and are typically not pay-per-click advertising. Social networks such as Facebook and Twitter have also adopted pay-per-click as one of their advertising models.
From this, we could conclude that a link from a page with PR4 and 5 outbound links is worth more than a link from a page with PR8 and 100 outbound links. The PageRank of a page that links to yours is important but the number of links on that page is also important. The more links there are on a page, the less PageRank value your page will receive from it.
Relative to other marketing mediums, pay-per-click marketing is still in its infancy with a very long, promising future. As you establish your own history with online marketing and expand your knowledgebase, remind yourself to be like Tony Montana (only the positive, inspirational qualities… ignore the rest). Be hungry, scrappy, and aggressive and work harder and smarter than your competitors. As Tony said “The World is Yours!”
Google PageRank (Google PR) is one of the methods Google uses to determine a page's relevance or importance. Important pages receive a higher PageRank and are more likely to appear at the top of the search results. Google PageRank (PR) is a measure from 0 - 10. Google Pagerank is based on backlinks. The more quality backlinks the higher Google Pagerank. Improving your Google page rank (building QUALITY backlinks ) is very important if you want to improve your search engine rankings.

It’s good to know how you rank both nationally and locally for keywords, but it’s undoubtedly more helpful to get actionable data and insights on how to improve. Moz Pro offers strategic advice on ranking higher, a major benefit to the tool. It also crawls your own site code to find technical issues, which will help search engines understand your site and help you rank higher.
Opting out of the Google Display network is a best practice if you are just getting started. The Display Network will incur thousands of impressions by displaying your ads across thousands of sites. If you are working with a constrained budget, the Google Display network can deplete your budget quickly and compromise your visibility on Google.com. *The Display network can be effective with carefully selected keywords and ad text designed specifically for this type of ad placement. It is always best to revisit this tactic once you have garnered initial learnings from the Google Search network.
Although the full scope of SEO is far too broad to cover comprehensively here, all you need to know is that SEO focuses primarily on achieving higher rankings from an organic perspective. Businesses may hire an agency or SEO professional to perform their SEO work, but beyond this investment, no money changes hands and all the emphasis is placed on ranking more highly in organic search.
Columns are another cross advertising platform feature that shows pre-determined metrics. Columns can be edited on all tabs within the engine interfaces. You can add data such as assisted conversations, competitive impression share metrics, conversion data calculations, and more. Columns act as a great way to customize the interface and view for your goals and analysis needs.
i.e. the PageRank value for a page u is dependent on the PageRank values for each page v contained in the set Bu (the set containing all pages linking to page u), divided by the number L(v) of links from page v. The algorithm involves a damping factor for the calculation of the pagerank. It is like the income tax which the govt extracts from one despite paying him itself.
The unique advantage of PPC marketing is that Google (and other ad networks) don’t just reward the highest bidders for that ad space, they reward the highest-quality ads (meaning the ads that are most popular with users). Essentially, Google rewards good performance. The better your ads, the greater your click-through rates and the lower your costs.
“When we started working with Brick Marketing, we had just been subjected to a Google algorithm update and our websites both took substantial hits to traffic. Within a few months, Brick has taken both of our websites to pre-algorithm traffic and conversion levels, and for the CallFinder site, the traffic has increased over 80% year-over-year. Their expertise in SEO, responsive design, and content marketing helped us turn the situation around, and we could not be happier with the results we’ve seen in just our first four months of working with them. The team we work with at Brick Marketing is always available for off-the-cuff consultations and are at the ready to provide recommendations and suggestions to improve our site’s appearance and performance. They are truly a hands-on partner, which is immensely valuable to our business.​”
The appearance of search engine results pages is constantly in flux due to experiments conducted by Google, Bing, and other search engine providers to offer their users a more intuitive, responsive experience. This, combined with emerging and rapidly developing technologies in the search space, mean that the SERPs of today differ greatly in appearance from their older predecessors.
Imagine the page, www.domain.com/index.html. The index page contains links to several relative urls; e.g. products.html and details.html. The spider sees those urls as www.domain.com/products.html and www.domain.com/details.html. Now let’s add an absolute url for another page, only this time we’ll leave out the “www.” part – domain.com/anotherpage.html. This page links back to the index.html page, so the spider sees the index pages as domain.com/index.html. Although it’s the same index page as the first one, to a spider, it is a different page because it’s on a different domain. Now look what happens. Each of the relative urls on the index page is also different because it belongs to the domain.com/ domain. Consequently, the link stucture is wasting a site’s potential PageRank by spreading it between ghost pages.

Google's founders, in their original paper,[17] reported that the PageRank algorithm for a network consisting of 322 million links (in-edges and out-edges) converges to within a tolerable limit in 52 iterations. The convergence in a network of half the above size took approximately 45 iterations. Through this data, they concluded the algorithm can be scaled very well and that the scaling factor for extremely large networks would be roughly linear in {\displaystyle \log n} , where n is the size of the network.
As I was telling Norman above, these days what we’ve come to call content marketing is really a big part of “link building.” You can’t buy links, and “you link to me I’ll link to you” requests often land on deaf ears. Its really all about creating high quality content (videos, images, written blog posts) that appeals to the needs/wants of your target market, and then naturally earning inbound links from sources that truly find what you have to offer worth referencing.
Using keywords on the Display Network is called contextual targeting. These keywords match your ads to websites with the same themes. For instance, the Display keyword “shoes” will match to any website that Google deems is related to shoes. These keywords aren’t used as literally as Search keywords, and they’re all considered broad match. Keywords in an ad group act more like a theme. Display keywords can be used alone, or you can layer them with any other targeting method to decrease scope and increase quality.

Link page A to page E and click Calculate. Notice that the site’s total has gone down very significantly. But, because the new link is dangling and would be removed from the calculations, we can ignore the new total and assume the previous 4.15 to be true. That’s the effect of functionally useful, dangling links in the site. There’s no overall PageRank loss.
What seems to be happening is that the toolbar looks at the URL of the page the browser is displaying and strips off everything down the last “/” (i.e. it goes to the “parent” page in URL terms). If Google has a Toolbar PR for that parent then it subtracts 1 and shows that as the Toolbar PR for this page. If there’s no PR for the parent it goes to the parent’s parent’s page, but subtracting 2, and so on all the way up to the root of your site.  If it can’t find a Toolbar PR to display in this way, that is if it doesn’t find a page with a real calculated PR, then the bar is greyed out.
Customers are often researching online and then buying in stores and also browsing in stores and then searching for other options online. Online customer research into products is particularly popular for higher-priced items as well as consumable goods like groceries and makeup. Consumers are increasingly using the Internet to look up product information, compare prices, and search for deals and promotions.[21]
Building on site authority and trust (off-site optimization) is one of the most critical search engine ranking signals. Search engines measure the popularity, trust and authority of your website by the amount and quality of websites that are linking to your site.  We work with our clients to develop an SEO strategy which stimulates link acquisition organically and supplements those strategies with additional services. Our content / editorial marketing finds the highest quality websites that are relevant to your business, and where you are positioned organically on authoritative and trusted site.

What seems to be happening is that the toolbar looks at the URL of the page the browser is displaying and strips off everything down the last “/” (i.e. it goes to the “parent” page in URL terms). If Google has a Toolbar PR for that parent then it subtracts 1 and shows that as the Toolbar PR for this page. If there’s no PR for the parent it goes to the parent’s parent’s page, but subtracting 2, and so on all the way up to the root of your site.  If it can’t find a Toolbar PR to display in this way, that is if it doesn’t find a page with a real calculated PR, then the bar is greyed out.


The flat-rate model is particularly common to comparison shopping engines, which typically publish rate cards.[5] However, these rates are sometimes minimal, and advertisers can pay more for greater visibility. These sites are usually neatly compartmentalized into product or service categories, allowing a high degree of targeting by advertisers. In many cases, the entire core content of these sites is paid ads.
For the examples, we are going to ignore that fact, mainly because other ‘Pagerank Explained’ type documents ignore it in the calculations, and it might be confusing when comparing documents. The calculator operates in two modes:- Simple and Real. In Simple mode, the calculations assume that all pages are in the Google index, whether or not any other pages link to them. In Real mode the calculations disregard unlinked-to pages. These examples show the results as calculated in Simple mode. pagerank, page rank
Using Dr Dave Chaffey's approach, the digital marketing planning (DMP) has three main stages: Opportunity, Strategy and Action. He suggests that any business looking to implement a successful digital marketing strategy must structure their plan by looking at opportunity, strategy and action. This generic strategic approach often has phases of situation review, goal setting, strategy formulation, resource allocation and monitoring.[60]
How does pagerank work? This is one of the basic questions that you must have, if you are here to find page rank or for a regular page ranking check. If you want to find out the Page Rank of a website using our Google PageRank Checker or PR Checker, you want to add the URL for numerous pages – not just the “Home" page. Google pagerank checker will give different PR values for each link. If you plan on purchasing advertising or buying a “used" website, this free PageRank Checker or PR Checker can help you make an informed decision.
CTR matters because it is a metric that can be controlled by marketers. However, while Google’s emphasis on CTR should be noted, it is also important that marketers don’t get tunnel vision with improving CTR. It is not an uncommon mistake for marketers to focus primarily on improving CTR… to their detriment. Creating highly attractive ads for the sole purpose of increasing CTR could be a costly error that ultimately impact your account history, especially if the ads are misleading and result in high bounce rates.
There are three main types of results on a SERP: Pages that the search engine spider has crawled and indexed; pages that have been manually added to the search engine’s directory; and pages that appear as a result of paid inclusion. The highest-ranking hits generally link to the most useful information; links grow less relevant as they move farther down the list.
In the parlance of digital marketing, advertisers are commonly referred to as sources, while members of the targeted ads are commonly called receivers. Sources frequently target highly specific, well-defined receivers. For example, after extending the late-night hours of many of its locations, McDonald's needed to get the word out. It targeted shift workers and travelers with digital ads, because the company knew that these people made up a large segment of its late night business. McDonald's encouraged them to download a new Restaurant Finder app, targeting them with ads placed at ATMs and gas stations, as well as on websites that it new its customers frequented at night.
Winning a Related Question might resulted in a small CTR bump. However Related Questions are also useful as a method of finding Featured Snippet keyword opportunities related to your existing keywords. If you find Related Questions on a SERP, try tracking the question as a keyword in itself. Most of the time that keyword will have a Featured Snippet which you can win.
Mega-sites, like http://news.bbc.co.uk have tens or hundreds of editors writing new content – i.e. new pages - all day long! Each one of those pages has rich, worthwile content of its own and a link back to its parent or the home page! That’s why the Home page Toolbar PR of these sites is 9/10 and the rest of us just get pushed lower and lower by comparison…
“NOTE: You may be curious what your site’s or your competitor’s PR score is. But Google no longer reveals the PageRank score for websites. It used to display at the top of web browsers right in the Google Toolbar, but no more. And PR data is no longer available to developers through APIs, either. Even though it’s now hidden from public view, however, PageRank remains an important ingredient in Google’s secret ranking algorithms.”
Instead of relying on a group of editors or solely on the frequency with which certain terms appear, Google ranks every web page using a breakthrough technique called PageRank™. PageRank evaluates all of the sites linking to a web page and assigns them a value, based in part on the sites linking to them. By analyzing the full structure of the web, Google is able to determine which sites have been “voted” the best sources of information by those

You can focus on your targets so you can write targeted ad copy and bid/budget appropriately. You can do this based on categories, URLs, page titles, or page content. For example, you could set a target for all URLs with “purple-shoes” in the string. That would allow you to know all searches and ads will be about purple shoes, so you could write ad copy and bid accordingly.


Vertical search is the box that appears at the top of the page when your search requires Google to pull from other categories, like images, news, or video. Typically, vertical search relates to topical searches like geographical regions -- for example, when you search “Columbia, South Carolina,” Google delivers a “Things to do in Columbia” box, along with a “Columbia in the News” box.
Again, all of these ad spots are sold in an auction. To show your own ad here, you would bid the maximum amount you’re willing to pay for a click on your ad. Bid the most in that auction and you have a chance of ranking number 1 in these sponsored or paid results. Note that we said a chance. There’s also something called quality score that can impact your ranking. More on that in a minute.
The digital marketer usually focuses on a different key performance indicator (KPI) for each channel so they can properly measure the company's performance across each one. A digital marketer who's in charge of SEO, for example, measures their website's "organic traffic" -- of that traffic coming from website visitors who found a page of the business's website via a Google search.

Opting out of the Google Display network is a best practice if you are just getting started. The Display Network will incur thousands of impressions by displaying your ads across thousands of sites. If you are working with a constrained budget, the Google Display network can deplete your budget quickly and compromise your visibility on Google.com. *The Display network can be effective with carefully selected keywords and ad text designed specifically for this type of ad placement. It is always best to revisit this tactic once you have garnered initial learnings from the Google Search network.


To answer your question, David, take a look at Jim’s comment below. Yes, you can and SHOULD optimize PR by directing link equity at important pages and internally linking within a theme. PageRank is a core part of the Google ranking algo. We don’t get visibility into PageRank as a number or score, but you need to know about the concept in order to direct your internal, strategic linking and navigation.
More specifically, who gets to appear on the page is based on and advertiser’s Ad Rank, a metric calculated by multiplying two key factors – CPC Bid (the highest amount an advertiser is willing to spend) and Quality Score (a value that takes into account your click-through rate, relevance, and landing page quality). This system allows winning advertisers to reach potential customers at a cost that fits their budget. It’s essentially a kind of auction. The below infographic illustrates how this auction system works.
It is beneficial to have the inbound links coming to the pages to which you are channeling your PageRank. A PageRank injection to any other page will be spread around the site through the internal links. The important pages will receive an increase, but not as much of an increase as when they are linked to directly. The page that receives the inbound link, makes the biggest gain.
We are looking for someone to manage our PPC campaign. We are a new company selling high end diamond eternity rings. It's a niche category so we want someone who knows the in and out of marketing via PPC to get us the traffic that is looking for this product. Candidate should have some product knowledge of eternity rings and should have some diamond knowledge. less more
The PageRank concept is that a page casts votes for one or more other pages. Nothing is said in the original PageRank document about a page casting more than one vote for a single page. The idea seems to be against the PageRank concept and would certainly be open to manipulation by unrealistically proportioning votes for target pages. E.g. if an outbound link, or a link to an unimportant page, is necessary, add a bunch of links to an important page to minimize the effect.

While working at a Fortune 100 company for nine years before moving to lead my current team, I became fascinated by customer behavior. What kinds of digital offerings most deeply engage customers in their digital lives? I started by looking at some case studies of the products, services, communications and experiences that had been embraced and adopted by customers during the first two decades of the internet. Over a period of seven years working on inbound marketing campaigns, what I found was a recurring pattern of three behaviors that drove the adoption of new digital experiences, which I call the three core behaviors of a network:


Generally speaking, “ad position” is influenced by the amount you are willing to pay (max CPC bid) and the relevancy of the ad to the keywords in your ad group (Quality Score). Quality Score is a numeric representation of the relevancy of your ads and keywords assigned independently by both Google and Bing. It is important to note that only Google’s Quality Score impacts ad position currently. Bing’s Quality Score serves only as a guideline to improve your ad/keyword relevancy. We will discuss Quality Score in further detail in Part B.


With this, appearing in Google’s local pack is now more important than ever. In 2014, Mediative conducted an eye-tracking research studying where users look on Google’s SERP. The study showed that users often focus their attention near the top of the page, on the local search results, and the first organic search result. In addition to this, several studies have concluded that organic search listings receive more than 90% of the clicks, with users favoring local search results the most.
Email marketing - Email marketing in comparison to other forms of digital marketing is considered cheap; it is also a way to rapidly communicate a message such as their value proposition to existing or potential customers. Yet this channel of communication may be perceived by recipients to be bothersome and irritating especially to new or potential customers, therefore the success of email marketing is reliant on the language and visual appeal applied. In terms of visual appeal, there are indications that using graphics/visuals that are relevant to the message which is attempting to be sent, yet less visual graphics to be applied with initial emails are more effective in-turn creating a relatively personal feel to the email. In terms of language, the style is the main factor in determining how captivating the email is. Using casual tone invokes a warmer and gentle and inviting feel to the email in comparison to a formal style. For combinations; it's suggested that to maximize effectiveness; using no graphics/visual alongside casual language. In contrast using no visual appeal and a formal language style is seen as the least effective method.[48]
Although GoTo.com started PPC in 1998, Yahoo! did not start syndicating GoTo.com (later Overture) advertisers until November 2001.[14] Prior to this, Yahoo's primary source of SERPS advertising included contextual IAB advertising units (mainly 468x60 display ads). When the syndication contract with Yahoo! was up for renewal in July 2003, Yahoo! announced intent to acquire Overture for $1.63 billion.[15] Today, companies such as adMarketplace, ValueClick and adknowledge offer PPC services, as an alternative to AdWords and AdCenter.
PageRank was influenced by citation analysis, early developed by Eugene Garfield in the 1950s at the University of Pennsylvania, and by Hyper Search, developed by Massimo Marchiori at the University of Padua. In the same year PageRank was introduced (1998), Jon Kleinberg published his work on HITS. Google's founders cite Garfield, Marchiori, and Kleinberg in their original papers.[5][17]
If someone clicks on your PPC listing, they arrive at your website on a page you’ve selected, and you are charged an amount no more than what you bid. So, if you bid $1.50 maximum on the keyword ‘widgets’, and that’s the highest bid, you’ll probably show up first in line. If 100 people click on your PPC listing, then the search engine or PPC service will charge you a maximum of $150.00.
In 1998, two graduate students at Stanford University, Larry Page and Sergey Brin, developed "Backrub", a search engine that relied on a mathematical algorithm to rate the prominence of web pages. The number calculated by the algorithm, PageRank, is a function of the quantity and strength of inbound links.[21] PageRank estimates the likelihood that a given page will be reached by a web user who randomly surfs the web, and follows links from one page to another. In effect, this means that some links are stronger than others, as a higher PageRank page is more likely to be reached by the random web surfer.
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