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In baseball a tag out, sometimes just called a tag, is a play in which a baserunner is out because he is touched by the fielder's hand holding a live ball while the runner is in jeopardy. A baserunner is in jeopardy when:
A tag is the most common way to retire baserunners who are not in danger of being forced out (as in (1) above), but a tag can put runners out on a force or a non-force play, as well as on an appeal play (as in (3) or (4) above). 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.