Every SERP is unique, even for search queries performed on the same search engine using the same keywords or search queries. This is because virtually all search engines customize the experience for their users by presenting results based on a wide range of factors beyond their search terms, such as the user’s physical location, browsing history, and social settings. Two SERPs may appear identical, and contain many of the same results, but will often feature subtle differences.
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The default page of Google’s search result is a page on which different results appear. Google decides which results fit your search query best. That could be ‘normal’ results, but also news results, shopping results or images. If you’re searching for information, a knowledge graph could turn up. When you’re searching to buy something online, you’ll probably get lots of shopping results on the default result page.
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.
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.
 Laura Granka discusses PageRank by describing how the pages are not simply ranked via popularity as they contain a reliability that gives them a trustworthy quality. This has led to a development of behavior that is directly linked to PageRank. PageRank is viewed as the definitive rank of products and businesses and thus, can manipulate thinking. The information that is available to individuals is what shapes thinking and ideology and PageRank is the device that displays this information. The results shown are the forum to which information is delivered to the public and these results have a societal impact as they will affect how a person thinks and acts.
Search engine optimization (SEO) is the process of affecting the online visibility of a website or a web page in a web search engine's unpaid results—often referred to as "natural", "organic", or "earned" results. In general, the earlier (or higher ranked on the search results page), and more frequently a website appears in the search results list, the more visitors it will receive from the search engine's users; these visitors can then be converted into customers. SEO may target different kinds of search, including image search, video search, academic search, news search, and industry-specific vertical search engines. SEO differs from local search engine optimization in that the latter is focused on optimizing a business' online presence so that its web pages will be displayed by search engines when a user enters a local search for its products or services. The former instead is more focused on national or international searches.