A softcover book, also known as paperback is a type of book characterized by a thick paper or paperboard cover, and often held together with glue rather than stitches or staples. Compared to case bound books, softcover books are lower cost books thanks to the use of cost-effective paper, glued bindings, and the lack of a hard cover. To create a softcover book all pages are stacked together and then glued along the spine edge with a very strong and flexible glue. After the pages have dried, a heavier stock paper is glued to the spine as a cover. Since there is no folding – except the cover – the pages are easy to line up and the edges of the finished book are very clean.