WIKI-

A type of website that allows users to add, remove or edit most of the content very quickly and easily. The ease of interaction and operation makes wiki a tool for collaborative sites and communities. The term wiki can also refer to the software that enables users to participate in a website. The name comes from the Hawaiian term “wiki-wiki” which means fast.

Essentially, a wiki is an editable website that doesn’t require users to know HTML or any other programming language. Most systems have a record of changes, so that a page can be reverted to any of its previous states. Many wikis allow completely unrestricted access so that people are able to contribute the site without registering. There is no moderation before posting, but the content is often moderated afterward.