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A dust jacket is a loose paper cover on the outside of a hardcover book, usually printed in color on glossy paper. Also called a book jacket or dust cover. Dust jacket design is a form of graphic art.
On the inside flap of the dust jacket there is usually a promotional blurb written by the publisher. The back flap may provide biographical information about the author and illustrator. The ISBN is almost always printed on the back of the dust jacket, usually in the lower right-hand corner, often accompanied by brief excerpts from positive reviews of the book.