Books may be available in one or more of the following formats:
Hardcover: Within the book industry, known as "Trade Cloth".
Paperback: Book is bound in a flexible paper cover, and is often a lower-priced edition of a hardcover book. Paper quality is often higher than a mass-market paperback, and book is often larger than a mass-market paperback.
Mass-Market Paperback: More common than a paperback book, a mass-market paperback is about four inches wide and seven inches high, and usually is printed on pulp or newsprint-type paper. Seen most often as mystery, science fiction and romance books.
Library Binding: Book is hardcover, with a reinforced binding made for more extensive use, such as in a library.
Spiral Binding: Book is fastened together by a spiral of wire or plastic that coils through a series of holes punched along one side of the covers and each page, much like a notebook.
Audiobook (book on CD), unabridged version: Book is a word for word recorded narration of the printed book, usually by one narrator.
Audiobook (book on CD), abridged version: Book is a shortened, edited, recorded version of the printed book. Editing may or may not be approved by the author.