Despite the name, the ball used is not soft. It is about 12 in. (30 cm) in circumference (sometimes larger for slow-pitch), which is 3 in. (8 cm) larger than a baseball. The infield in softball is smaller than in baseball; each base is 60 ft (18 m) from the next, as opposed to baseball's 90 ft (27 m). There are two types of softball: in the most common, slow-pitch softball, the ball, sometimes larger than the standard 12 in, must arch on its path to the batter, 10 players make up a team, and bunting and stealing are prohibited; in fast-pitch softball the pitch is fast, there are 9 players on a team, and bunting and stealing are permitted. Softball rules vary somewhat from those of baseball. Two major differences are that the ball must be pitched underhand—from 46 ft (14 m) for men or 40 ft (12 m) for women as compared with 60.5 ft (18.4 m) in baseball—and that seven innings instead of nine constitute a regulation game.
See M. Pagnoni and G. Robinson, Softball: Fast and Slow Pitch (1990).
Game resembling baseball but played on a smaller diamond with a larger ball (12 in. [30.5 cm] in circumference), which is pitched underhand. Since the first standard set of rules was published in the 1920s, the game has been popular as an amateur sport in the U.S., and since the 1960s it has grown considerably in popularity outside of North America. In U.S. high schools and colleges it is a popular women's sport; a women's softball competition was added to the Olympic Games in 1996.
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