An International Standard Book Number (ISBN) is a unique numeric commercial book identifier which is assigned to each book or edition that is published. It is used by publishers, booksellers, and libraries to identify, track, and order books. ISBNs were first introduced in 1966 and have become the international standard for book identification.
There are many benefits to using ISBNs. They help to ensure that books can be easily identified and ordered, and they also provide a way to track sales and inventory. ISBNs are also used by libraries to catalog and manage their collections.