PageRank is the idea that Google created to leap-frog over other search engines during 1990s. The term Pagerank identifies the relevantancy of the web page in the search engine results pages.

PageRank holds US patent number 6,285,999 granted on the 4th September 2001 to Larry Page, one of Google’s founders. Page’s idea is based on established practice for scientific papers where the importance of a paper is based on the number of citations made to it by other papers.

The Google algorithm interprets a link from one page to another as a vote. The Google algorithm and the configuration of web pages means that page rank can be fed back so that pages that have more votes are then deemed to be more important and the votes they cast (outbound-links) are subsequently given more weight.

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