This document discusses wikis and their use in education. It begins by defining wikis as websites that allow for collaborative editing using a web browser. Wikis track document history and allow easy reversion to previous versions. The document then discusses how wikis can be used for student collaboration on projects and course materials. It provides options for creating wikis from scratch by installing wiki software, or using hosted wiki services that manage the technical aspects. Finally, it lists and describes many free hosted wiki services and their features.