PageRank Explained

Sergey Brin and Larry Page, Google founders, developed a system for ranking pages, PageRank. PageRank is a measurement of the importance of a page via the number of pages linking to that particular page. If only it were that simple ... additionally, PageRank takes into account the importance of the page linking to a particular page. PageRank™ is a trademark of Google. The following is from Google's website.

Google's complex, automated methods make human tampering with our results extremely difficult. And though we do run relevant ads above and next to our results, Google does not sell placement within the results themselves (i.e., no one can buy a higher PageRank). A Google search is an easy, honest and objective way to find high-quality websites with information relevant to your search.