Wikipedia is a multilingual, web-based, free content encyclopedia project. Wikipedia is written collaboratively by volunteers; the vast majority of its articles can be edited by anyone with access to the Internet. Wikipedia's name is a portmanteau of the words wiki (a type of collaborative website) and encyclopedia. Its main servers are in Tampa, Florida, with additional servers in Amsterdam and Seoul. Wikipedia's English edition was launched on January 15, 2001, as a complement to Nupedia, an expert-written and now defunct encyclopedia. The project is currently operated by the Wikimedia Foundation, a non-profit organization created by Jimmy Wales, who claims to be the sole founder of Wikipedia. This is disputed by Larry Sanger, who also claims to be a founder of Wikipedia. Wikipedia has approximately 7.5 million articles in 253 languages.