MediaWiki is an Open Source wiki software package which was originally developed to serve the needs of Wikipedia, a free wiki-based encyclopedia. MediaWiki is one of the most popular general wiki solutions providing a rich core feature set and a mechanism to attach extensions to provide additional functionality.

A wiki is a type of website that allows the visitors themselves to easily add, remove and otherwise edit and change some available content, sometimes without the need for registration. This ease of interaction and operation makes a wiki an effective tool for collaborative authoring.