Mass market paperback
1982 mass-market paperback edition of "Life, the Universe and Everything" by Douglas Adams; typical yellowing due to age can be seen along the outer edges (right and bottom)
A mass market paperback is a small, non-illustrated, and relatively cheap version of a book, usually coming out after the hardback and often sold in airports and supermarkets as well as in bookstores.
This article is a stub. You can help Wikipedia by expanding it.