Softball is a variant of baseball played with a larger ball on a smaller field. It was invented in 1887 in Chicago as an indoor game. It was at various times called indoor baseballThere are three types of softball:
slow-pitch softball, the ball, which can measure either 11 or 12 inches in circumference depending on the age and league, must arch on its path to the batter, and there are 10 players on the field at once.
Fast-pitch: the pitch is fast, there are nine players on the field at one time, and bunting and stealing are permitted.
Modified softball restricts the windmill windup of the pitcher, although the pitcher is allowed to throw as hard as possible with the restricted back swing. 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 43 ft (13.1 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.