Wikipedia is a free online encyclopedia supported by the non-profit Wikimedia Foundation. Wikipedia maintains about 30 million articles in 286 languages, including over 4.2 million in the English Wikipedia which are written by volunteers around the world.
Wikipedia serves as the largest and most popular general reference work on the Internet. This wiki was first launched in 2001 by Jimmy Wales and Larry Sanger. Its predecessor was originally Nupedia which was revived by a wikian on August 7, 2013.