<P> A hardcover or hardback (also known as hardbound, and sometimes as case - bound) book is one bound with rigid protective covers (typically of Binder's board or heavy paperboard covered with buckram or other cloth, heavy paper, or occasionally leather). It has a flexible, sewn spine which allows the book to lie flat on a surface when opened . Following the ISBN sequence numbers, books of this type may be identified by the abbreviation Hbk . </P> <P> Hardcover books are often printed on acid - free paper, and they are much more durable than paperbacks, which have flexible, easily damaged paper covers . Hardcover books are marginally more costly to manufacture . Hardcovers are frequently protected by artistic dust jackets, but a "jacketless" alternative is becoming increasingly popular: these "paper - over-board" or "jacketless hardcover" bindings forgo the dust jacket in favor of printing the cover design directly onto the board binding . </P>

What is the difference between hardcover and hardback books
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