Differences between Wikipedia, Wikimedia, MediaWiki, and wiki/da

Hvad er forskellen på MediaWiki, Wikimedia, Wikipedia og wiki?

Wiki
Wiki is a generic term which is used to describe a certain kind of collaborative website that can be edited by any user and/or visitor; it is not a proper noun.
 * 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").
 * den allerførste wiki skabtes 1995 til mønster-kartoteketet Portland Pattern Repository og kaldtes oprindelig WikiWikiWeb.
 * wiki software er software eller program-stykker, som får wiki-baserede websites til at fungere. Softwaren kan være skrevet i diverse programmerings-sprog og være simpel eller mere veludbygget med avancerede funktioner. Se Wikipedia-artiklen "wiki software" eller PPR's sorterede liste.

For en mere komplet beskrivelse, se Wikipedia-artiklen "wiki".

Wikimedia
Wikimedia is the collective name for the Wikimedia movement, revolving around a group of inter-related projects, including Wikipedia, Wiktionary, Wikiquote 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.
 * Wikimedia servere benævnes den computer hardware, hvor Wikimedia projekterne hostes. Serverne drives og overvåges primært af frivillige, hvoraf mange også arbejder med udvikling af MediaWiki software (se nedenfor).
 * 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 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).
 * Wikimedia Meta-Wiki, forkortet Meta, er en wiki der bruges til at drøfte spørgsmål vedrørende Wikimedia projekterne. Se også: About.
 * Meta should not be confused with MetaWiki, a search engine that is not part of the Wikimedia group of projects.

Wikipedia
Wikipedia is a Wikimedia project that is a global, free and multilingual internet encyclopedia. It is the oldest, and largest, Wikimedia project, predating the Wikimedia Foundation itself. Wikipedia is a wiki that runs on MediaWiki.

MediaWiki
MediaWiki is a particular wiki engine, that is developed for and used by Wikipedia and the other Wikimedia projects. MediaWiki is freely available for others to use (and improve), and it is in use by all sorts of projects around the world.

Video

 * [//www.youtube.com/watch?v=gXD1TRGafQ0 The State of Wikipedia] on YouTube