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]

Ok this is some pretty high level stuff here. There is still a lot of good information as well though. I remember when I was able to see the page rank of website on my google toolbar. I never really fully understood what it meant until later. What a person should focus on is good SEO practices to make search engines naturally want to feature your content on their search results.
A navigational page is a simple page on your site that displays the structure of your website, and usually consists of a hierarchical listing of the pages on your site. Visitors may visit this page if they are having problems finding pages on your site. While search engines will also visit this page, getting good crawl coverage of the pages on your site, it's mainly aimed at human visitors.
Goals and Objectives. Clearly define your objectives in advance so you can truly measure your ROI from any programs you implement. Start simple, but don’t skip this step. Example: You may decide to increase website traffic from a current baseline of 100 visitors a day to 200 visitors over the next 30 days. Or you may want to improve your current conversion rate of one percent to two in a specified period. You may begin with top-level, aggregate numbers, but you must drill down into specific pages that can improve products, services, and business sales.
It is important to remember that just because digital marketing uses different communications techniques to traditional marketing, its end objectives are no different from the objectives that marketing has always had. It can be easy to set objectives for digital marketing based around ‘vanity metrics’ such as number of ‘likes’ or followers, so it is useful to bear in mind this definition of marketing advanced by the Chartered Institute of Marketing:
On the other hand, marketers who employ digital inbound tactics use online content to attract their target customers onto their websites by providing assets that are helpful to them. One of the simplest yet most powerful inbound digital marketing assets is a blog, which allows your website to capitalize on the terms which your ideal customers are searching for.
This SEO tutorial teaches you a "beat the leader" approach to search engine ranking with SEO tips that have worked for our digital marketing clients. To see what Google or Bing thinks is best for any specific attribute, we look at the sites they are currently rewarding — the top-ranked results. Once you know what structural and content choices worked for the "leaders," you can do even better by making your pages the "least imperfect"!

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Today, there are many PR Checker tools that you can find on internet. Some of the PageRank checker tools that you will find over internet will be free while some PR Checker tools may require you to register, sign up or install. What makes our Google PageRank checker unique is its user-friendly interface, ease of use and the fact that you can benefit from this amazing PR checker for absolutely free.
Inclusion in Google's search results is free and easy; you don't even need to submit your site to Google. Google is a fully automated search engine that uses web crawlers to explore the web constantly, looking for sites to add to our index. In fact, the vast majority of sites listed in our results aren't manually submitted for inclusion, but found and added automatically when we crawl the web. Learn how Google discovers, crawls, and serves web pages.3
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.