Wiki
A wiki ( WICK-ee) is a form of hypertext publication on the internet which is collaboratively edited and managed by its audience directly through a web browser. A typical wiki contains multiple pages that can either be edited by the public or limited to use within an organization for maintaining its internal knowledge base. It has got it's name from the first user-editable website called "WikiWikiWeb". The "wiki" meaning quick.
Wikis are powered by wiki software, also known as wiki engines.