WikipediaA white sphere made of large jigsaw pieces, with letters from several alphabets shown on the piecesWikipedia wordmarkThe logo of Wikipedia, a globe featuring glyphs from several writing systemsScreenshotType of siteOnline encyclopediaAvailable in 301 languagesOwner Wikimedia FoundationCreated by Jimmy Wales, Larry Sanger1Website wikipedia.orgAlexa rank Steady 5 (Global, October 2018)Commercial NoRegistration Optionalnotes 1Users >306,861 active usersnotes 2 and >78,581,574 registered usersLaunched January 15, 2001; 17 years agoCurrent status ActiveContent licenseCC Attribution / Share-Alike 3.0Most text is also dual-licensed under GFDL; media licensing variesWritten in LAMP platform2OCLC number 52075003Wikipedia (/?w?k??pi?di?/ (About this soundlisten), /?w?ki?pi?di?/ (About this soundlisten) WIK-ih-PEE-dee-?) is a multilingual, web-based, free encyclopedia based on a model of openly editable and viewable content, a wiki.

It is the largest and most popular general reference work on the World Wide Web,345 and is one of the most popular websites by Alexa rank.6 It is owned and supported by the Wikimedia Foundation, a non-profit organization which operates on money it receives from donors.789Wikipedia was launched on January 15, 2001, by Jimmy Wales and Larry Sanger.10 Sanger coined its name,1112 as a portmanteau of wikinotes 3 and “encyclopedia”. Initially an English-language encyclopedia, versions in other languages were quickly developed. With 5,754,417 articles,notes 4 the English Wikipedia is the largest of the more than 290 Wikipedia encyclopedias.

Overall, Wikipedia comprises more than 40 million articles in 301 different languages14 and by February 2014 it had reached 18 billion page views and nearly 500 million unique visitors per month.15In 2005, Nature published a peer review comparing 42 science articles from Encyclopædia Britannica and Wikipedia and found that Wikipedia’s level of accuracy approached that of Britannica.16 Time magazine stated that the open-door policy of allowing anyone to edit had made Wikipedia the biggest and possibly the best encyclopedia in the world, and was a testament to the vision of Jimmy Wales.17Wikipedia has been criticized for exhibiting systemic bias, for presenting a mixture of “truths, half truths, and some falsehoods”,18 and for being subject to manipulation and spin in controversial topics.19 In 2017, Facebook announced that it would help readers detect fake news by suitable links to Wikipedia articles. YouTube announced a similar plan in 2018.

In response, The Washington Post headlined, “Wikipedia, the ‘good cop’ of the Internet”.20