Any printed matter with more than 49 pages published by the publishing house, excluding the front cover and back cover, has a specific title and author's name, and has an international standard book number. A publication that is priced and protected by copyright is called a book.

Children's books are divided into lower grade learning, children's literature and art, children's literature, popular science, comics, game puzzles, card wall charts, early education, children's classics and so on.