An International Standard Book Number (ISBN) is a unique 13-digit numeric code that is used to identify books. It is assigned to each edition of a book and helps publishers, bookstores, libraries and other supply chain participants order, sell and track books.
The first digit of the ISBN identifies the language of the book, while the last digit is a check digit that is used to verify the accuracy of the ISBN. Publishers purchase ISBNs from an ISBN agency to register their books. No other published work can have the same ISBN as it belongs solely to that book. The ISBN is found in the barcode on the back cover of a book and is used to power electronic point-of-sale systems.
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