A wiki ( /ˈwɪki/ WIK-ee) is a website that allows the easy creation and editing of any number of interlinked web pages via a web browser using a simplified markup language or a WYSIWYG text editor. Wikis are typically powered by wiki software and are often used to create collaborative wiki websites, to power community websites, for personal note taking, in corporate intranets, and in knowledge management systems.
Wikis may exist to serve a specific purpose, and in such cases, users use their editorial rights to remove material that is considered “off topic.” Such is the case of the collaborative encyclopedia Wikipedia. In contrast, open purpose wikis accept content without firm rules as to how the content should be organized.
Ward Cunningham, the developer of the first wiki software, WikiWikiWeb, originally described it as “the simplest online database that could possibly work.” “Wiki” (pronounced [ˈwiti] or [ˈviti]) is a Hawaiian word for “fast”.
*The source of the above referenced definition is from Wikipedia*