Google is an Alphabet search engine for documents on the worldwide web, founded in 1997 by two PhD students at Standford University, Larry Page and Sergey Brin. Page and Brin had spent two years working on an advanced method for finding information on the Internet. Soon Google replaced AltaVista and became the world's most popular search engine. Users were satisfied with the search results and their presentation: on a quiet page, without the screaming ads seen on many other search engines. The name is a corruption of the term 'googol', the indication for a 1 with one hundred zeros (10100). Page is fascinated by mathematics, and the reference to this number reflects the company's mission to make all the information in the world accessible and useful. The name eventually became 'Google' due to a spelling error of Sean Anderson, co-inventor of the name, and at the time a fellow student of Page.