What Does International Standard Book Number (ISBN) Mean?
An International Standard Book Number (ISBN) is a unique number identifier that is assigned to each edition of a book. The ISBN is not only confined to printed material, but is assigned to each version of publication of a book that exists. The same book as an e-book, paperback, hardcover and other edition types would each have a different ISBN.
Techopedia Explains International Standard Book Number (ISBN)
A unique ISBN is assigned to a book upon publication. Originally, ISBNs were 10 digits long, but starting in 2007 the codes were changed to 13 digits. The 13-digit ISBNs have a three-digit country code, which was not present before.
