The ISBN-10, or International Standard Book Number, is a unique identifier for books, consisting of 10 digits. It helps publishers, booksellers, and libraries manage and track books efficiently. Each ISBN-10 is specific to a particular edition of a book, ensuring that different versions can be distinguished from one another. Introduced in 1970, the ISBN-10 format was widely used until 2007, when it was replaced by the longer ISBN-13. The transition to ISBN-13 was made to accommodate a growing number of publications and to improve the system's capacity. Both formats serve the same purpose of identifying books uniquely in the global marketplace.