Yahoo! Inc. is an American internet corporation founded in Santa Clara, California and headquartered in Sunnyvale, California, United States. The company is perhaps best known for its web portal, search engine, Yahoo! Directory, Yahoo! Mail, Yahoo! News, advertising, online mapping, video sharing, and social media websites and services. It is one of the largest websites in the United States. Yahoo! was founded by Jerry Yang and David Filo in January 1994 and was incorporated on March 1, 1995.