This document provides an introduction and overview of wikis. It defines wikis as editable websites that do not require HTML knowledge, with version tracking capabilities. Wikis allow pages to be read and edited by users with proper permissions. They foster collaboration and are useful for brainstorming, drafting policies, and sharing responsibilities. Wikipedia is provided as an example wiki with over a million articles in several languages. The benefits of wikis include their ease of use, ability to share knowledge, enable collaboration across borders, and revert pages to previous versions.