This document discusses using wikis to facilitate collaboration and learning. Wikis allow for easy collaboration as they require no HTML knowledge, pages can be quickly shared and edited, and old versions can be reverted to. Wikis foster learning communities by encouraging cooperation, interaction, and shared goals. They support constructivist learning by allowing students to construct knowledge through active participation and manipulation of content. The document provides examples of how wikis can be structured to support different types of collaborative learning, such as individual student pages linked together or a shared class page. Overall, wikis create opportunities for deeper engagement and knowledge building through collaboration.