playing cards, set of cards that are numbered or illustrated (or both) and are used for playing games, for education, for divination, and for conjuring. Traditionally, Western playing cards are made of rectangular layers of paper or thin cardboard pasted together to form a flat, semirigid material. They are uniform in shape and size and small enough for several to be held together in one hand, frequently fanned out so that the identifying marks on each card can be seen. One side of each card—its front, or face—is marked so as to render it identifiable and distinguishable from its fellows,