Yahoo! Inc. (NASDAQ: YHOO ) is an American multinational internet corporation headquartered in Sunnyvale, California, United States. The company is perhaps best known for its web portal, search engine (Yahoo! Search), Yahoo! Directory, Yahoo! Mail, Yahoo! News, Yahoo! Groups, Yahoo! Answers, advertising, online mapping (Yahoo! Maps), video sharing (Yahoo! Video), and social media websites and services. It is one of the largest websites in the United States.