A wiki (wɪki/ WIK-ee) is a website which allows collaborative modification of its content and structure directly from the web browser. In a typical wiki, text is written using a simplified markup language
(known as "wiki markup")The markup language used on a Wiki page is most commonly called Wiki Syntax. It uses common characters in uncommon ways (or character combinations that are not normally used together) and provides them with a special meaning. Some of the character combinations only work at the beginning of a line, while others can be inserted anywhere in the text and are active until they are turned off.
, and often edited with the help of a rich-text editor. A wiki Web site operates on a principle of collaborative trust. The simplest wiki programs allow users to create and edit content. The most popular wiki is Wikipedia.