(pronounced "wicky" or "weeky" or "viki") is a website (or other hypertext document collection) that allows multiple users to add content, while keeping track of the different contributions.
In short, a Wiki is one of the most powerful tools for web-based collaborative editing
and a prominent example of emerging social software
is the software used to create and run such websites. For instance, this wiki runs on the WikkaWiki
More information on Wikis is available on: Wikipedia