back cover

the outermost cover of a book that typically includes a brief summary or blurb of the book's content, as well as other promotional information

A back cover is the outer part of a book's binding, located on the opposite side of the front cover. It typically contains a summary or description of the book's content, along with quotes or reviews that highlight its appeal. The back cover may also include the author's biography, a barcode, and the book's price. Its purpose is to provide potential readers with key information that can help them decide whether to read or purchase the book.