Wikipedia is free content that anyone can edit, use, modify, and distribute. This is a motto applied to all Wikimedia foundation project: use them for any purpose as you wish.

"Wiki" (pronounced [wiki]) is a Hawaiian word meaning "quick". The online encyclopedia project Wikipedia is the most popular wiki-based website, as well being one of the most popular websites on the entire internet, having been ranked consistently as such since at least 2007.

The domains wikipedia.org and wikipedia.com (later redirecting to wikipedia.org) were registered on January 13, 2001, and January 12, 2001, respectively. Wikipedia was launched on January 15, 2001 as a single English-language edition at www.wikipedia.com, and was announced by Sanger on the Nupedia mailing list.

Wikipedia is a free, open content online encyclopedia created through the collaborative effort of a community of users known as Wikipedians. Anyone registered on the site can create an article for publication; registration is not required to edit articles.