A book jacket feature is an important part of a book's presentation. The most common features are a BIO, BLURB, SNAP, lapels, and LAPEL. A BIO is a short biography of the author, usually found on the back cover of the book. A BLURB is a brief description of the book, also found on the back cover. A SNAP is a small picture or illustration that is often found on the front cover. Lapels are two flaps of material that fold over the front cover of the book, while a LAPEL is a single flap of material that folds over the back cover. All of these features help to give readers an idea of what the book is about before they purchase it.