Wikis are online collaborative writing spaces that allow multiple authors to edit and contribute to a document simultaneously. They offer benefits like facilitating group projects, sharing resources, and allowing students and teachers to view writing processes over time through previous document versions. However, wikis also present challenges as they conflict with traditional notions of authorship and intellectual property. Teachers may face student reluctance or discomfort with public writing. Overall, wikis promote a highly collaborative view of composing and creativity when used effectively in educational settings.