Dust wrappers are protective coverings for hardcover books. They're usually made of paper and are removable, and they provide an extra layer of protection against dust and other types of damage. Some people might also call them dust jackets or book jackets, and occasionally they're simply referred to as book covers. However, the term "dust wrapper" is perhaps the most common name for this particular type of book covering, especially in British English. Regardless of what you choose to call them, having a dust wrapper on a hardcover book can help keep it in good condition for years to come.