Bases, diamond, infield, batter's box, coach's box, on deck circle, pitcher's rubber, fould line. A strike can be either a called strike by the umpire or a swing and miss strike. A foul ball is a strike. However a player cannot be called out for hitting a foul ball.
Different associations have different rules.
Some allow a strike to land on the plate. Some all In baseball and fast pitch softball, the ball must cross the plate between the batters knees and chest. Some associations count a foul ball with 2 strikes as an out. A foul tip is a strike and the batter is out if the catcher catches it before it hits the ground. A fouled bunt attempt with 2 strikes is an out.