When the airplane contacts the ground with a sharp impact it tends to bounce back into the air. The airplane does not bounce like a rubber ball. Instead, it rebounds into the air because the wing’s angle of attack was abruptly increased, producing a sudden addition of lift.
The corrective action for a bounce is the same as for ballooning and similarly depends on its severity. When it is slight and there is no extreme change in the airplane’s pitch attitude, a follow-up landing may be executed by applying power to cushion the next touchdown, and smoothly adjusting the pitch to the correct landing attitude. When a bounce is severe, the safest procedure is to EXECUTE A GO-AROUND IMMEDIATELY.
Do you want to know more? The Airplane Flying Handbook and other FAA manuals are available here.