The Rule
Under the Official Baseball Rules used in Major League Baseball and many lower leagues, "Infield Fly" is explained by rule 2.00 (Definitions of terms: Infield Fly), and rule 6.05e (Batter is out).
The rule applies only when there are fewer than two outs, and there is a force play at third base (i.e., when there are runners at first and second base, or the bases are loaded). In these situations, if a fair fly ball is in play, and in the umpire's judgment it is catchable by an infielder with ordinary effort, the umpire shall call "infield fly" (or more often, "infield fly, batter's out"); the batter will be out regardless of whether the ball is actually caught in flight. Umpires typically raise the right arm straight up, index finger pointing up, to signal the rule is in effect.
If "infield fly" is called and the fly ball is caught, it is treated exactly as an ordinary fly ball; the batter is out, there is no force, and the runners must tag up. On the other hand, if "infield fly" is called and the ball lands fair without being caught, the batter is still out, and there is still no force, but the runners are not required to tag up. In either case, the ball is live, and the runners may advance on the play, at their own peril.
An infield fly may be declared by any umpire on the field.
Read more about this topic: Infield Fly Rule
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