Softcover books glued / sewn and glued / with flaps.
Softcover binding is also referred to as softbound, softback or paperback. The paper used for the cover of a softcover book may be thicker than the interior pages (for extra durability) or the cover may be the same thickness as the interior pages (for cost savings). The main advantages of printing a book with a softcover binding method include the relatively low cost, quicker turnaround time and widespread availability. This is why softcover binding is more popular than hardcover binding for most printed books.