Rappel is a mountain-climbing technique that involves descending a steep slope or cliff face using a rope. It is also known as abseiling, and is used by climbers to safely descend from a mountain or other high place. The climber attaches one end of the rope to an anchor point at the top of the cliff, and then uses a friction device to control their descent. RAPPEL is a popular technique among experienced climbers, as it allows them to safely and quickly descend from a mountain.