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It all began with Google and now most major search engines use link popularity as an important ranking criterion. At Google, they call it PageRank (PR), which has been its hallmark since 1998. PR evaluates Web structure through link analysis to determine relevancy. It's an algorithm factor that gives higher rankings to sites with many strong, quality links leading to their pages. Such sites are deemed to be highly relevant because of all the incoming links.
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Try google search in order to know more information about the increase of Page rank!