Definition & Meaning of "International Standard Book Number"

What is an "ISBN"?

An ISBN, or International Standard Book Number, is a unique identifier assigned to books and other publications. It helps to distinguish one book from another, making it easier for booksellers, libraries, and distributors to track and manage inventory. Each ISBN is a 13-digit number, previously 10 digits, that includes information about the book's publisher, title, edition, and format. The ISBN is usually found on the back cover of a book, near the barcode, and is used in cataloging and sales systems to ensure accuracy and efficiency in book distribution.