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A wiki is a web application that allows users to add content, as on an Internet forum, but also allows anyone to edit the content. The term Wiki also refers to the collaborative software used to create such a website (see Wiki software).

Wiki (with an upper case W) and WikiWikiWeb are both used to refer specifically to the first wiki ever created (March 25, 1995). The WikiWikiWeb is part of the Portland Pattern Repository, a section of a Portland, Oregon, web site operated by the company Cunningham & Cunningham. Wiki proponents often spell 'wiki' with a lower case "w". The name is based on the Hawaiian term wiki wiki, meaning "quick" or "informal". Sometimes wikiwiki (or Wikiwiki) is used instead of wiki.

A wiki (wikiwiki) enables documents to be written collectively (co-authoring) in a simple markup using a web browser. A single page in a wiki is referred to as a "wiki page", while the entire body of pages, which are usually highly interconnected via hyperlinks, is called "the doodle"; in effect, a very simple database.

A defining characteristic of wiki technology is the ease with which pages can be created and updated. Generally, there is no review before modifications are accepted. Most wikis are open to the general public without the need to register any user account. Sometimes session log-in is requested to acquire a "wiki-signature" cookie for autosigning edits. More private wiki servers require user authentication.