Book divisions, also known as parts of a book, are the sections that divide a book into smaller parts. CHAPTERS are the most common type of book division, and they are typically 8 letters long. CHAPTERS are used to divide a book into smaller sections, making it easier to read and understand. Other types of book divisions include sections, volumes, and parts. Sections are used to further divide CHAPTERS into smaller parts, while volumes and parts are used to divide a book into larger parts.