Paperback (noun)

1. A book bound in stiff paper or cardboard covers, as opposed to a hardcover or leather-bound book.
2. A book that is published in a inexpensive and portable format.

Origin:

From the word "paper" and "back".

Examples:

1. The novel is available in both hardcover and paperback versions.
2. I prefer to read paperbacks because they're more portable and lightweight.
3. The bookstore had a wide selection of paperbacks, including both fiction and nonfiction titles.
4. The author's latest book was released in paperback form.
5. The paperback edition of the book was much cheaper than the hardcover version.