For fast pitch softball, international play and NCAA is bottom of the shoulders to lower portion of the knees. And the width of the plate.
NOTE: Due to size of the ball the strike zone in softball can seem wider than MLB, but it's similar. Also the rules of the batters box differ between softball and Baseball.
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It is the space over home plate between the batters front shoulder and the knees when the batter is in a normal batting stance. Keep in mind that the zone can differ greatly from one umpire to another.