A wiki is simply a web site to which you can add, edit, or delete content from within a Web browser. The first wiki was created by a programmer named Ward Cunningham. Cunningham derived the name of his brainchild from the Hawaiian word wikiwiki, which means quickly. A wiki is a lot like a Web site on steroids. It displays information, which you and other users can edit. The wiki tracks all of the changes and enables you to roll back to a previous version of a page or the site as a whole. And, like a Web site, the various pages of a wiki can be easily linked together.

Many wikis allow you to make changes without the need to log in with a user name and password; others require an account. While you can make any changes that you want, the wiki keeps track of the revisions. The person who administers the wiki can roll back any changes.

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