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Types of Wikis
Guerilla Wikis
A guerilla wiki is a wiki requiring no or minimal installation that is used, generally in a corporate environment, as an alternative to hosting a wiki server. Because of the red tape involved in allocating IT resources to hosting a wiki server and the restrictions placed on regular user computers, it is often difficult or impossible to install a wiki in a corporate environment. Similarly, it is generally a violation of security policy to post sensitive corporate information on an externally managed wiki. Therefore, employees in need of a wiki can place a guerilla wiki, generally in the form of a small program or html file that requires no installation, onto a shared drive to be used in lieu of an "official" wiki. An example of guerilla wiki is tiddlywiki.
InterWiki
InterWiki is a facility for creating links to the many wiki wiki webs on the World Wide Web. Users avoid pasting in entire URLs (as they would for regular web pages) and instead use a shorthand similar to links within the same wiki (intrawiki links). Look up InterWiki in Wiktionary, the free dictionary.
Unlike domain names on the Internet, there is no globally defined list of InterWiki prefixes — and owners of a wiki must define a mapping appropriate to their needs. Users generally have to create separate accounts for each wiki they intend to use (unless they intend to edit anonymously). Variations in text formatting and layout can also hinder a seamless transition from one wiki to the next.
By making wiki links simpler to type for the members of a particular community, these features help bring the different wikis closer together. Furthering that goal, InterWiki "bus tours" (similar to webrings) have been created to explain the purposes and highlights of different wikis. Such examples on Wikipedia include Wikipedia:TourBusStop and Wikipedia:WikiNode.
Corporate Wikis
A corporate wiki is a wiki used in a corporate context, contrary to a wiki accessible to the public via internet. In some cases this requires additional features of integration in the corporate information landscape, as well as enhanced access control.
Wikis are increasingly used internally by companies and public sector organizations, some as prominent as Adobe, Microsoft and the FBI. Depending on the size of a corporation, they represent an addition or a replacement to centrally-managed Content Management Systems. They potentially allow a more flexible approach to Project Management than dedicated software.