Book
A book is a written work of substantial length created by one or more authors. They can be distributed in various forms such as printed books, audiobooks, and electronic books (ebooks). Books are broadly classified into fiction, containing invented narrative or other imaginary content; and non-fiction, containing content intended as factual truth.
The term may also refer to the physical or electronic object containing such a work. Modern books are typically printed in a codex format, composed of many pages bound together and protected by a cover.