A pitch, in baseball, is when a pitcher throws the baseball to the batter. This is a pitcher's main job. The pitcher tries to get the player who is at-bat out. If a pitcher throws three strikes, the batter strikes out (unless the third strike is a foul tip). A strike is when a pitch is in the zone from the batter's knees to the belt and the width of home plate (the "strike zone"), and if the batter does not swing. A strike is also called if a batter swings at any pitch and misses, or if a batter hits a ball into foul territory (this is called a "foul tip"). If a pitcher throws a ball outside of the strike zone and the batter does not swing, this is called a "ball". If four of these are thrown, the batter gets to go to first base for free. This is called a "walk".