dice game, possibly the world's most common gambling game with dice. The version known as bank craps, casino craps, or Las Vegas–style craps is played in virtually all American casinos (casino) and also in some British, Australian, and Asian casinos and gambling houses. A special table and layout are used, and all bets are made against the house. A player signifies his bet by placing chips or cash on the appropriate part of the layout before any roll. It is invariably required that the dice be thrown so that they strike a wall of the table and bounce back.

In Bank Craps the player throwing the dice (the shooter), or anyone wishing to bet that the shooter will win, places his bet “on the line” (in the area marked “Pass,” “Come,” or “Win” on various layouts). Anyone betting against the shooter places his bet in the area marked “Don't Pass” or “Don't Come.” The shooter is said to win if he throws 7 or 11 (a natural) on his first throw (the comeout roll) and lose if he instead throws 2, 3, or 12 (craps). Bets are then settled. If the shooter's first throw is 4, 5, 6, 8, 9, or 10, that number is his point, and he continues to throw until he rolls the same number again (makes his point) and wins or throws 7 (misses out, or craps out) and loses both his bet and the dice. If the shooter loses (or if he wins but declines to shoot again), he must pass the dice to the next player on his left. If the shooter wins, he may keep the dice and must put up the next bet. Side bets may be laid with or against the shooter, either before he has a point or after. Anyone wishing to bet on a special outcome of any roll, such as which number will or will not be thrown, places his bet in the appropriate space on the layout; such bets are called proposition bets. The house has a mathematical advantage of between 1.4 and 11.1 percent, depending on the type of bet. A slightly different version of bank craps, called eastern or New York craps, and with another type of table layout (sometimes called a double-end dealer), can be found in casinos in the Caribbean and the eastern United States.

The version of the game called money craps, or open craps, is found in simpler or illegal gaming houses and is mostly played for cash on a table without the elaborate layout found in bank craps. The players may gamble with each other on the shooter's point numbers, but all other wagers must be placed with the book (the organizers of the game), for which the players must pay a charge, usually 5 percent. In private crap games the rules are rather more informal, and the players bet against each other, proposing or accepting (fading) any bets they wish.

Craps is derived from the English dice game hazard. The private form of craps played in the United States evolved in the mid-19th century among African Americans. The originator of bank craps and the forerunner of the present table layout in casinos is generally recognized to have been American bookmaker and dice manufacturer John H. Winn, who developed this form of the game about 1910.