

A pitch that misses the strike zone is called a ball if the batter doesn't swing. Strikes are desirable for the pitcher and the fielding team, as three strikes result in a strikeout of that batter. Whether a pitch passes through the zone is decided by an umpire, who is generally positioned behind the catcher. The strike zone is defined as the volume of space above home plate and between the batter's knees and the midpoint of their torso. In baseball, the strike zone is the volume of space through which a pitch must pass in order to be called a strike even if the batter does not swing. The batter attempts to hit a baseball pitched by the pitcher (not pictured) to the catcher and the umpire decides whether pitches are balls or strikes. A labelled drawing of the strike zone superimposed onto an image from a game, showing a batter, catcher and umpire.
