A balk is any of a large number of illegal actions made by a pitcher when he is on the rubber. When this happens, the ball is declared dead and all base runners are awarded the next base. The main reason for the rule is give a runner a fair change to steal a base. Simply put, a balk is a fake pitching move- an attempt to make it look to the runner like a pitch in being made when in fact the ball is being held in the pitcher's hand or going to a base.
It is also a balk when the catcher is out of the catcher's box when the pitcher begins his pitch, and when any player other than the catcher is not in fair territory when the pitcher begins his pitch.
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I am referring to a pitchers balk.
There are some illegal moves that a pitcher can not do after he gets in position. Usually some sort of incorrect movement of the hands. But, balks are very rare. If one occurs, everyone moves up a base.
A balk is when a pitcher does his/her windup but does not actually pitch the ball. It usually occurs by accident that the ball slips out of your hand the wrong way or something to that affect. Therefore it fakes out the batter resulting as a ball.