Google is a multinational public cloud computing, Internet search, and advertising technologies service. Search the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly what you're looking for. Google hosts and develops a number of Internet-based services, products, and online advertising options through its AdWords program.
Bing is a search engine that finds and organizes the answers you need so you can make faster, more informed decisions. Bing (formerly Live Search, Windows Live Search, and MSN Search) is advertised as a "decision engine" from Microsoft.
Yahoo! is the world's most visited home page. Quickly find what you're searching for, get in touch with friends and stay in-the-know with the latest news, entertainment, and sports information. The portal also gives users access to other Yahoo! services like Yahoo! Mail, Yahoo! Maps, Yahoo! Finance, Yahoo! Groups and Yahoo! Messenger.
Wikipedia is a free, collaborative, multilingual Internet encyclopedia supported by the non-profit Wikimedia Foundation. Its 20 million articles (over 3.8 million in English alone) have been written collaboratively by volunteers around the world. Almost all of its articles can be edited by anyone with access to the site, and it has about 100,000 regularly active contributors.