An out in baseball happens to the batter or his teammates on the field in a game. When a player is out, they leave the field, and when there are 3 outs, the other team goes up to bat. One way to get an out is if a baseball is caught while in the air and before it touches the ground after being hit by the batter. Another way is to strike out. To strike out you have to either miss the ball or not swing at good pitches three times while batting. Tag outs and force outs are the other main ways players get out.