ISBNkoodi

ISBNkoodi, commonly known as ISBN (International Standard Book Number), is a unique numeric identifier assigned to books and related publications. Established in 1970, the ISBN system aims to simplify the distribution, cataloging, and purchase of books by providing a standardized identification method. Each ISBN consists of various parts that encode information about the publisher, the specific title or edition, and the check digit used for verification.

The standard format of an ISBN has evolved over time. Originally, it was a 10-digit number, but since 2007, the ISBN has expanded to a 13-digit format to align with the EAN (European Article Number) barcode system. The 13-digit ISBN is divided into five parts: the prefix element (usually 978 or 979), the registration group element (indicating language or country), the registrant element (the publisher), the publication element (specific edition or title), and the check digit.

ISBNs are assigned by designated registration agencies in each country or region. Publishers and booksellers use ISBNs to manage inventories, facilitate ordering, and improve discoverability within global book markets. The system is managed by the International ISBN Agency, which oversees the registration and distribution of ISBNs worldwide.

Having a unique ISBN helps authors, publishers, librarians, and booksellers streamline operations and ensures that each edition of a book can be distinctly identified. An ISBN does not encode information about the content or quality of a book but serves solely as a standardized identifier to aid in efficient cataloging and distribution.