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Yahoo! Inc.. is an American public corporation with headquarters in Sunnyvale, California (specifically in Silicon Valley), which provides Internet services globally, covering the entire world. The company is famous for its web portal, search engine (Yahoo! Search), Yahoo Directory, Yahoo Mail, Yahoo News, advertising, online mapping (Yahoo! Maps), Yahoo Video, and social media websites and services.

Yahoo pioneered by Jerry Yang and David Filo in January 1994 and was inaugurated as a legal entity on March 1, 1995. On January 13, 2009, Yahoo lifted Carol Bartz, Autodesk's former chief executive, as chief executive and members of Yahoo's new board of directors.