Wiki books is a collection of open-content textbooks that anyone can edit. Wiki books is for textbooks, annotated texts, instructional guides, and manuals. These materials can be used in a traditional classroom, an accredited or respected institution, a home-school environment, as part of a Wikiversity course, or for self-learning. As a general rule, only instructional books are suitable for inclusion. Non-fictional books (as well as fictional ones) that aren't instructional aren't allowed on Wiki books. Literary elements, such as allegory or fables, that are used as instructional tools can be permitted in some situations.

Wiki books includes both minor and major book-like projects.

Materials which may not be appropriate for Wiki books should only be removed in accordance with the deletion policy.