In book publishing and manufacturing, the terms "end pages," "endpapers," or "endsheets" refer to the folded sheets of paper (usually thicker than the book paper) at the very beginning and very end of a HARDCOVER book that securely attach the interior pages to the cover. In other words, they are glued to the actual hard cover. They serve both a structural and aesthetic purpose, essentially acting as the bridge that fuses the book block (the bound interior pages) to the case (the hard cover). When a printer creates a paperback book, the cover is glued directly to the pages, traditional end pages are exclusively used in hardcover books. Endpaper - Structure: It is typically a single sheet folded in half. - Pastedown half: One side is glued flat against the inside of the front or back hardcover board. This is called the pastedown (or board paper) and covers the raw edges of the cover material. Flyleaf - Structure: The other unglued half of the folded endpaper sheet that remains loose. - Free page: It acts as the first blank, colored, or decorated page you turn to when opening the book (and the last page before the back cover). It should be noted that KDP does not print end pages for paperbacks.