Wikipedia, the Internet Encyclopedia, just celebrated it's 15 birthday. The site is one of the top ten visited on the Internet, and is hosted by the non-profit Wikimedia foundation.
WikipediaJimmy Wales and Larry Sanger launched Wikipedia on January 15, 2001. Sanger coined its name, a portmanteau of wiki[notes 3] and encyclopedia. Initially only in English, Wikipedia quickly became multilingual as it developed similar versions in other languages, which differ in content and in editing practices. The English Wikipedia is now one of 291 Wikipedia editions and is the largest with 5,056,303 articles (having reached 5,000,000 articles in November 2015).