There are two kinds of cue ball jumps, one immediately after the cue strikes the cue ball and one where the cue ball jumps after contact with another object.
A legal stroke to jump a cue ball immediately must strike the cue ball above center - this drives the cue ball into the table surface from which it rebounds. Strking the cue ball below center to lift the ball intentionally is called a scoop shot and is a foul.
A cue ball can be made to jump after hitting a rail by using extreme draw or follow.
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