Yahoo! Inc. (NASDAQ: YHOO) is an American public corporation incorporate and headquartered in Sunnyvale, California, in Silicon Valley and a global Internet services company. It provides a range of products and services including a Web portal, a search engine, the Yahoo! Directory, Yahoo! Mail, news, and posting. It was founded by Stanford University graduate students Jerry Yang and David Filo in January of 1994 and incorporated on March 1, 1995.