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1.

Developed by Larry Page and Sergey Brin at Stanford University and Founders of Google.
The software examines dozens of aspects of the page's content and the content of the pages linking to it to determine if it's a good match for your query.

Google's copyright software combines PageRank and other sophisticated text-matching techniques to find pages that are both important and relevant to your search. The software goes far beyond the number of times a term appears on a page and examines dozens of aspects of the page's content and the content of the pages linking to it to determine if it's a good match for your query.
PageRank analyzes the page's of your search and then votes. The Votes cast pages as "important" to give you the most accurate pages for your search
by C2theE June 12, 2008