Dust jacket
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The dust jacket (sometimes dust wrapper or dust cover) of a hardback book is the paper, usually illustrated and including front and back flaps, that protects the binding of the book from scratches. However, since dust jackets themselves have value, aesthetic and sometimes financial, they themselves are sometimes wrapped in transparent, acetate book jacket covers. In the world of book collecting the presence or absence of an original dust jacket has a significant impact on a collectible book's value. Often the front flap has information about the story, and the back flap tells about the author.
In schools, teachers often require students to use book covers to protect textbooks. Made of paper, fabric, or plastic, these function like a dust jacket to protect the front and back cover from damage.