A Wiki is a page [or site with a group of pages] that can be edited and therefore improved by anyone who edits it. Therefore allowing improvement by the community.
This site is a Wiki, free free to improve it!
What is a Wiki Site?
This was here when the site was made so I am moving it here
According to Wikipedia, the world's largest most valdalised wiki site:
A Wiki ([ˈwiː.kiː] <wee-kee> or [ˈwɪ.kiː] <wick-ey>) is a type of website that allows users to add, remove, or otherwise edit and change most content very quickly and easily.
And that is it! As a part of Wikidot.com network this Site is a customizable piece of the Internet where Users can edit content, upload files, communicate and collaborate. Even more so than Wikipedia!
Wiki in terms of Wikipedia
A Wiki ([ˈwiː.kiː] <wee-kee> or [ˈwɪ.kiː] <wick-ey>) is a type of website that allows users to vandalise and make crappy redirect in the place of actual information very quickly and easily.