Definition
An ISBN (International Standard Book Number) is a unique numeric identifier assigned to a specific book edition and format. Retailers and libraries use it to track inventory and metadata.
Example
The paperback and ebook of the same title need separate ISBNs because they are different formats.
Related terms
Common mistakes
- Reusing one ISBN for hardcover, paperback, and ebook editions.
- Buying ISBNs from unofficial resellers that do not register you as publisher of record.