Google

www.google.com

*May searches: 9.1 billion

Google is poised to remain the 800-pound gorilla in the search arena for some time to come. Thirteen years ago, Stanford PhD students Larry Page and Sergey Brin thought to rank Web sites in importance by how many other Web sites link to them. That simple concept is still important, and has helped Google build its market dominance (64.2% of the search pie, according to ComScore) and generate massive profits that have allowed it to expand into a wide range of new products, from Gmail and Google News to its Chrome Web browser.

Pictured: Brin and Page

*Does not include Google News, Google Blog Search, or other products separate from general search