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How Does Google PageRank Work?
PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page's value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B.
But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important."
Important, high-quality sites receive a higher PageRank, which Google remembers each time it conducts a search. Of course, important pages mean nothing to you if they don't match your query. So, Google combines PageRank with sophisticated text-matching techniques to find pages that are both important and relevant to your search. Google goes far beyond the number of times a term appears on a page and examines all aspects of the page's content (and the content of the pages linking to it) to determine if it's a good match for your query. “
There are arguments to say that PageRank carries a lot of power when it comes to search engine optimisation within Google. Google prefers sites with large amounts of content and large amounts of inward bound links. It is important to structure your site well in terms of internal linking because depending on your aim, it is possible to focus your PageRank on a certain page or ensure it balances well throughout the site.
Pages with high PageRank are likely to feature much higher than their competitors for certain keywords even if the rest of their optimisation is of equal stature.
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