Wiki

A wiki is a website that allows the easy creation and editing of any number of interlinked web pages via a web browser. The wikis and their connections collectively form the wikisphere. The "wiki way" is a concept of how wikis operate that specifies that wikis should make errors easy to correct rather than hard to make. This emphasizes transparency and the avoidance of any loss of information. This makes it easy for others to review and reverse undesirable changes.

Link

 * Wikipedia on the concept of "wiki"