This document discusses using wikis in the classroom. It begins by defining a wiki as a website that allows collaborative editing by users. It then reviews the history and creation of wikis, led by Ward Cunningham in 1994. Examples of top wiki sites are provided. Early concerns about the reliability of wikis are outlined, such as accuracy and expertise of editors. However, it notes that wikis can now be trusted as they are monitored and accuracy has improved. The document proposes using a wiki as a think tank in class, allowing students to contribute pages and discussions. It provides examples of how wikis can be used as websites for collaboration and organizing information.