Library binding can be divided into the two major categories of "original" and "after market". The original category is as it says: the book was originally bound with the idea that it would be used in a library setting where the book would receive harder use than those usual trade editions sold to the public.
The aftermarket library binding is the method of binding serials, and re-binding paperback or hardcover books, for use within libraries. Library binding increases the durability of books, as well as making the materials easier to use.[citation needed]