Wikipedia is a free, collaborative, multilingual Internet encyclopedia supported by the non-profit Wikimedia Foundation. Its 20 million articles 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. As of July 2011, there are editions of Wikipedia in 282 languages. It has become the largest and most popular general reference work on the Internet, ranking sixth globally among all websites having an estimated 365 million readers worldwide.
Wikipedia was launched in January 2001 by Jimmy Wales and Larry Sanger.
Sanger coined the name Wikipedia, which is a portmanteau of wiki (a technology for creating websites collaboratively, from the Hawaiian word wiki, meaning "quick") and encyclopedia.
Wikipedia's departure from the expert-driven style of encyclopedia building and the presence of a large body of unacademic content has received ample attention in print media. In its 2006 Person of the Year article, Time magazine recognized the rapid growth of online collaboration and interaction by millions of people around the world. It cited Wikipedia as an example, in addition to YouTube, MySpace, and Facebook. Wikipedia has also been praised as a news source because of how quickly articles about recent events appear. Students have been assigned to write Wikipedia articles as an exercise in clearly and succinctly explaining difficult concepts to an uninitiated audience.
Although the policies of Wikipedia strongly espouse verifiability and a neutral point of view, critics of Wikipedia accuse it of systemic bias and inconsistencies (including undue weight given to popular culture, its reliability and accuracy are also targeted. Other criticisms center on its susceptibility to vandalism and the addition of spurious or unverified information; though some scholarly work suggests that vandalism is generally short-lived. A 2005 investigation in Nature showed that the science articles they compared came close to the level of accuracy of Encyclopedia Britannica and had a similar rate of "serious errors”. Power to the people.
