A dust jacket, also known as a dust cover or book cover, protects a book’s case from wear. The case includes the front and back covers along with the spine. The dust jacket is made from paper with two flaps that fit over the front and back covers, wrapping around the spine to encase the entire cover. The jacket is normally detachable and is typically covered with acetate, a clear, thin, plastic-like material that increases longevity.

In addition to protecting a book, a professional dust jacket is also used to promote the book. The cover is typically illustrated and includes title and author. It might also feature a tagline — a short sentence meant to entice a would-be reader’s interest by capturing the theme or tone of the book.

If the author has had a previous bestseller, the words “#1 New York Times Bestselling Author” might appear next to the author’s name. In fiction writing, an author’s name will adorn the top portion of the dust jacket if the author has had noted successes, with the book title printed in the middle of the dust cover or somewhat below the middle. The names of unknown or marginally successful writers appear at the bottom of the dust jacket, giving the title more attention.

The inside flaps of a dust jacket also provide valuable real estate. The front inside flap might contain a synopsis of the plot or book content. The back flap might continue from the front, or provide personal information about the author in the form of a mini biography. The back of the dust cover typically lists snippets of praise from other known authors, critics or media outlets, and might also have a plot synopsis. If this information appears on the back flap instead, the back cover might be illustrated with a professional photograph of the author.

You can protect books by adding your own dust jacket. For short-term use, such as a schoolbook, you can make a dust cover by cutting a large paper bag into a rectangle, making the height several inches taller than the book, and the length, several inches longer. Place the book roughly in the center, folding the top and bottom up against the book, making a crease in each case. Remove the book and fold down the top along the crease, doing the same with the bottom. Replace the book in the center, folding the paper over the book from left to right, adjusting the book to bring the ends of the paper together. Now crease the end-flaps against the book cover, then fold them in flat, and insert the book's case, top and back covers, into the flaps.

For longer protection and a nicer look, you can purchase dust jackets in packs. Some covers feature designs while others are clear. Dust jackets are also available for paperback books. When purchasing ready-made dust jackets be sure to get the proper size for your books.