The Fool is one of the 78 cards in a tarot deck. In tarot card reading, it is one of the 22 Major Arcana, sometimes numbered as 0 or XXII. However, in decks designed for playing traditional tarot card games, it is typically unnumbered, as it is not one of the 21 trump cards and instead serves a unique purpose by itself.

A playing card is a piece of specially prepared card stock, heavy paper, thin cardboard, plastic-coated paper, cotton-paper blend, or thin plastic that is marked with distinguishing motifs. Often the front (face) and back of each card has a finish to make handling easier. They are most commonly used for playing card games, and are also used in magic tricks, cardistry, card throwing, and card houses; cards may also be collected. Playing cards are typically palm-sized for convenient handling, and usually are sold together in a set as a deck of cards or pack of cards.