Created by Petr Škoda, the Book module makes it easy to create multi-page resources with a book-like format. This can be used to build complete book-like websites inside of your Moodle course.
Previously created websites can be imported directly into the Book module. Books can be printed entirely or by chapter.
The book module allows you to have main chapters and sub chapters, but it goes no deeper. In other words, sub chapters cannot have their own sub chapters. This was an intentional decision by the creator of the book module. He intended this to be a simple resource for teachers and students.
The book module is not interactive. You can, however, link to choices, forums, etc., from within a book. And you can include multimedia objects like Flash movies in your book.