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Wikipedia - Research & Contributing: Introduction to Wikimedia

What is a Wiki?

A wiki is a type of website whose contents can be edited from the web browser, and which keeps a version history for each editable page. Wikis are often, but not always, editable by any visitor to the site.

  • wiki (as an adjective), "the wiki way", and the antonym un-wiki are also used to describe the community-oriented philosophy that goes with such a system (e.g. "that's not a very wiki way of doing things").
  • Wiki (with a capital 'W') is an incorrect term, although it has sometimes been used to refer to either Wikipedia or the Portland Pattern Repository (also known as WikiWikiWeb), which was the first wiki to be created.
  • wiki software and wiki engine are terms referring to pieces of software that power wiki websites. There are many different types of wiki software; some very simple, others with advanced features.

Definition of a Wiki taken from Media Wiki page on the Differences between Wikipedia, Wikimedia, MediaWiki, and wiki

Wikimedia Project

Wikimedia is the collective name for the Wikimedia movement, revolving around a group of inter-related projects, including WikipediaWiktionaryWikiquote and others, which aim to use the collaborative power of the Internet, and the wiki concept, to create and share free knowledge of all kinds.

  • The term Wikimedia servers is often used, referring to the computer hardware on which all Wikimedia projects are hosted.
  • Wikimedia Foundation is a non-profit organization headquartered in San Francisco that runs the Wikimedia projects. Wikimedia Deutschland, Wikimedia Russia etc. are the names of dozens of local chapters of enthusiasts of Wikimedia projects. They are independent from the Wikimedia Foundation and the Wikimedia projects. Wikimedia, depending on the context and locale, is often incorrectly used as short name for the Wikimedia projects, or a chapter, or the Wikimedia Foundation (the latter can happen also on this wiki).
  • The Wikimedia Meta-Wiki, commonly referred to as Meta, is the wiki used to discuss issues which affect all Wikimedia projects. See also: Meta:About.
    • Meta should not be confused with MetaWiki, a search engine that is not part of the Wikimedia group of projects.

Definition of Wikimedia taken from Media Wiki page on the Differences between Wikipedia, Wikimedia, MediaWiki, and wiki

Wikimedia Mission Statement

The mission of the Wikimedia Foundation is to empower and engage people around the world to collect and develop educational content under a free license or in the public domain, and to disseminate it effectively and globally.

In collaboration with a network of chapters, the Foundation provides the essential infrastructure and an organizational framework for the support and development of multilingual wiki projects and other endeavors which serve this mission. The Foundation will make and keep useful information from its projects available on the Internet free of charge, in perpetuity.

Mission statement as fouind on the Wikipedia Mission Statement page. 

Wikimedia Projects