A book collection is a compilation of books that can be found in a variety of places, such as a personal LIBRARY, a bookstore, or a LIBRARY. CHARACTERS refers to the people, animals, or other entities that appear in the books, while PAGES refer to the number of PAGES in the book. LIBRARY refers to a place where books are stored and made available for public use. Collecting books can be a hobby for some, while others may use it as a way to learn more about a particular subject or to gain knowledge.