From Help Wiki
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A wiki is a type of website that allows users to add, remove, or otherwise edit and change most content very quickly and easily... This ease of interaction and operation makes a wiki an effective tool for collaborative writing. - from Wikipedia

Wikis at Evergreen

Wikis are most often used when a group wants to create a collaborative knowledge-base. Evergreen uses the same base install of Mediawiki found at Wikipedia but can be customized. Wiki sites are available for workgroups or academic offerings and may be requested by contacting Academic Computing.

See: About Mediawiki at Evergreen for more on using wikis in your teaching.

Getting started with wikis