A book groups several projects under the same umbrella.
Following the printed book philosophy, we can group projects (or chapters) in the same book with a common cover. Moreover, the LMS platform navigation is sequential (after chapter 1 we access chapter 2).
To create a book:
In addition, we can apply the same actions on a book as on projects and folders (publishing, renaming, deleting...). Also, a book can be converted to a folder ("Convert to folder") or a folder to a book ("Convert to book").