ISBN stands for “International Standard Book Number”. It is a unique identifier for books, eBooks, tapes, and CD’s. The ISBN numbering system is used worldwide and publishers around the globe identify their work in this standardized format. Each title or edition must be identified by a unique ISBN. In essence, the ISBN number for books is similar to a license plate which guarantees that each book type product is identified uniquely.

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Every ISBN consists of thirteen digits and whenever it is printed it is preceded by the letters ISBN. The thirteen-digit number is divided into four parts of variable length, each part separated by a hyphen.
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