DuckDuckGo is a privacy-preserving search engine company headquartered in Washington County, Pennsylvania, USA. The company's search results mainly come from search engines such as Yahoo! and Bing, and provides some additional search results and special features. DuckDuckGo is committed to protecting the privacy and security of users, does not track user search history, and does not sell personal information to advertising companies. In addition to search services, DuckDuckGo also provides other privacy protection tools and extensions, such as private browser extensions and anonymous email forwarding services.