Wikipedia [ˌvɪkiˈpeːdia] is a online-encylopedia in many languages. It is hosted by the Wikimedia Foundation.
The first Wikipedia was started in English by Jimmy Wales on 2001/01/15. It's the most used wiki in the internet. On the May, 07 2014 Wikipedia was the sixth most visited sites of the world's.
Today, the English Wikipedia is the biggest online-encylopedia of the internet with over 33,400,000 pages with 4,500,000 articles, 834,000 uploaded files like images and audio files. Also it have 1,400 Administrator and up to 21,900,000 user.