Page Rank is a ranking system that previously was the foundation of the infamous search engine, Google. When search engines were first developed, they ranked all websites equally and would return results based only on the content and meta tags the pages contained. At the time, however, the Page Rank system would revolutionize search engine rankings by including one key factor: a site's authority. To determine how important, or authoritative, a site was Google chose several big sites, such as cnn.com, dmoz.org, and espn.com. These sites were clear authorities, and Google figured that if these websites chose to link to another site (let's say site B), then site B would receive a piece of that site's authority. If site B were to link to another site (how about C), then site C would also receive a piece of authority, though much smaller. Using this system of passing authority, Google would then count up how much authority a site had and give it a Page Rank from 0 to 10. The Page Rank system has become more complicated since then, but this is how it all started.
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