ISSN

The International Standard Serial Number, or ISSN, is an eight-digit code assigned to a periodical publication, such as a magazine, journal or newspaper, so that libraries, publishers and distributors can refer to that exact title unambiguously regardless of how its name is printed or abbreviated elsewhere. Unlike a book, whose content is fixed, a periodical continues publishing new issues indefinitely, so the ISSN identifies the ongoing publication itself rather than any single issue, and it is especially useful for distinguishing between two different serials that happen to share the same title. Libraries rely on ISSNs for cataloging and for arranging interlibrary loans, and publishers use them in ordering and subscription management, making the number a practical backbone of how serial literature is tracked internationally.