It is all about mountain climbing using rope, karabiners, and harnesses. In old days it was known as abseiling that army and police force use for rescue campaigns. But now it is a well known extreme adventure sport that people love to do as a recreational activity. Mountain climber uses this for a safe climbing on mountains. Rappelling needs more efforts and risk as well as to do.
Waterfall rappelling is the related term to this where people rappel (climb) towards the source of the waterfall and it makes tougher this adventure sport. To do this you should make yourself fully equipped with helmet, gloves, knots, ascenders, and descenders. At the end of the knot, you should leave space about a foot of rope to make yourself safe from knot slip.
Sometimes it will be hazardous if you have not checked all the things that you are going to use for Rappelling. Check whether ropes, knots, karabiners, and harnesses that you have are functioning well or not.
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