Abseiling (/ˈæbseɪl/ AB-sayl or /ˈɑːpzaɪl/ AHP-zyle; from German abseilen 'to rope down'), also known as rappelling (/ˈræpɛl/ RAP-pell or /rəˈpɛl/ rə-PELL; from French rappeler 'to recall, to pull through'), is the controlled descent of a steep slope, such as a rock face, by moving down a rope. When abseiling, the person descending controls their own movement down a static or fixed rope, in contrast to lowering off, in which the rope attached to the person descending is payed out by their belayer.
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Belayer in the context of Top roping
Top rope climbing (or top roping) is a form of rock climbing where the climber is securely attached to a climbing rope that runs through a fixed anchor at the top of the route, and back down to the belayer (or "second") at the base of the climb. A climber who falls will be held by the rope at the point of the fall, and can then either resume their climb or have the belayer lower them down in a controlled manner to the base of the climb. Climbers on indoor climbing walls can use mechanical auto belay devices to top rope alone.
By definition, top roping can only be done on routes that are less than half the length of a typical climbing rope, which means single-pitch routes that are below 25–30 metres (82–98 ft) in height. Top roping is also used in ice climbing, and the related sports of mixed climbing and dry-tooling, and it is used in combination with auto belay devices in both competition speed climbing and competition ice climbing.
View the full Wikipedia page for Top ropingBelayer in the context of Traditional climbing
Traditional climbing (or trad climbing) is a type of free climbing in the sport of rock climbing where the lead climber places temporary and removable protection while simultaneously ascending the route; when the lead climber has completed the route, the second climber (also called the belayer) then removes this protection as they ascend the route. Traditional climbing differs from sport climbing where the protection equipment is already pre-drilled into the rockface in the form of permanent bolts. Traditional climbing is still the dominant format on longer multi-pitch climbing routes, including alpine and big wall routes.
Traditional climbing carries a much higher level of risk than with bolted sport-climbing as the climber may not have placed the temporary protection equipment correctly while trying to ascend the route, or there may be few opportunities such as cracks and fissures to insert satisfactory protection (e.g. on very difficult routes). Traditional climbing was once the dominant form of free climbing but since the mid-1980s, sport climbing — and its related form of competition climbing — became more popular for single pitch routes, and all technical grade milestones from 8a+ (5.13c) onwards were set on single-pitch sport-climbing routes.
View the full Wikipedia page for Traditional climbing