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In baseball and softball, a tag out, sometimes just called a tag, is a play in which a baserunner is out because a fielder touches him with the ball or with the hand or glove holding the ball, while the ball is live and the runner is in jeopardy of being put out – usually when he is not touching a base.
A baserunner is in jeopardy when any of the following are true:
A tag is therefore the most common way to retire baserunners who are not in danger of being forced out, though a forced runner may be tagged out in lieu of stepping on the forced base. Additionally, a tag out can be used on an appeal play.
Runners attempting to advance are sometimes thrown out, which means that a fielder throws the ball to someone covering the base, who then tags the runner before the runner touches the base. A runner who leads off a base too far might be picked off; that is, the pitcher throws to a fielder covering the base, who then tags the runner out.