Google was co-founded by Larry Page and Sergey Brin while they were students at Stanford University. It had an initial public offering in 2004 that raised $1.67 billion. Yahoo began as a student hobby and evolved into a global brand, founded by David Filo and Jerry Yang at Stanford University in 1994. A meta search engine sends search requests to multiple engines and aggregates the results, allowing users to search multiple engines simultaneously. Google makes money primarily through advertising on its search results pages.