A wiki is a new site template in Windows SharePoint Services 3.0 that makes it easy
to create, edit, link, and restore an individual Web page. Wikis can be used as
creative forums to brainstorm ideas, manage knowledge bases, create designs as well
as instruction guides or simply gather information in an easy-to-edit format. Wikis
are easy to create, modify, and annotate in addition to tracking contributions and
changes. Key features include:<br />
<ul>
  <li>Fast and easy page creation</li>
  <li>Easy and automatic linking</li>
  <li>Version differences</li>
  <li>What you see is what you get (WYSIWYG) Web page editing</li>
</ul>
<br />
Wikis leverage existing SharePoint functionality including search, navigation, alerts,
and custom fields.