Most people familiar with the Internet have heard of Google's PageRank system. By adding PageRank to other search factors, such as keyword frequency and content quality, Google was able to return higher quality search engine results than the competition.
As Google has evolved, so too has its algorithm for determining relevancy and ranking in its search results. While the exact formula remains a trade secret, it is a well-known fact that PageRank is only one part (possibly a very small one) of a complicated formula that determines a Web site's search engine ranking.
Let's take a closer look at PageRank: