Multi-pitch climbing in the context of "Verdon Gorge"

Free solo climbing (or free soloing) is a form of rock climbing where the climber (or free soloist) climbs on technical terrain without ropes or any form of protective equipment — they are allowed to use climbing shoes and climbing chalk (or ice tools and crampons if ice climbing). Free soloing is the most dangerous form of climbing, and, unlike bouldering, free soloists climb at heights where any fall can be fatal. Though many climbers have free soloed routes with technical grades that they are very comfortable on, only a tiny group free solo regularly, and at technical grades closer to the limit of their abilities.

The international profiles of some climbers have been significantly increased by their free soloing activities, such as Alex Honnold, Alex Huber, Alain Robert and John Bachar, but others question the ethics of this, and whether the risks that they are undertaking should be encouraged and commercially rewarded. While "free solo" was originally a term in climbing slang, after the popularity of the 2018 Oscar-winning film Free Solo, Merriam-Webster added the word to their English dictionary in September 2019.

Big wall climbing is a form of rock climbing that takes place on both very long and very sheer multi-pitch climbing routes – of at least 6–10 pitches or 300–500 metres in length – that typically require a full day, if not several days, to ascend. Big wall routes are sustained and exposed and the climbers typically remain suspended from the continuously sheer and vertical rock face, even hanging from the face when sleeping, with limited options to sit down or escape unless they abseil down the route—which is itself a complex and risky action. It is therefore considered a physically and mentally demanding form of rock climbing.

Big wall climbing is typically done by pairs of climbers using a traditional climbing style, but with the distinction that the non-lead climber usually ascends by jumaring up a fixed rope to save time and energy. It requires an extensive range of supplies and equipment over and above that of traditional-climbing that is carried in haul bags, such as portaledges, aid climbing equipment, poop tubes, and food and water. Big wall climbing also requires additional climbing techniques such as using pendulums/tension traversing, using aid climbing techniques, employing trail ropes, jumaring, and sometimes the technique of simul climbing.

Rock-climbing equipment varies with the specific type of climbing that is being undertaken by the climber(s). Bouldering needs the least equipment: climbing shoes, climbing chalk and optional crash pads. Sport climbing adds ropes, harnesses, belay devices, and quickdraws which clip into pre-drilled permanently-fixed bolts on the rock face. Traditional climbing adds the need to carry a "rack" of temporary and removable passive and active protection devices. Multi-pitch climbing, and the related big wall climbing, adds devices to assist in ascending and descending static fixed ropes. Finally, aid climbing uses unique equipment to give mechanical assistance to the climber in their upward movement (e.g. aiders).

Advances in rock-climbing equipment design and manufacture are a key part of the rock climbing history, starting with the climbing rope. Modern rock-climbing devices enable climbers to perform tasks that were previously done manually, but with greater control – in all conditions – and with less effort. Examples of such replacements include the harness (replaced tying the rope around the waist), the carabiner (replaced many knots), the descender/abseil device (replaced the dülfersitz), the ascender (replaced the prusik knot), the belay device (replaced the body belay), and nuts/hexes (replaced chockstones).

In climbing and mountaineering, belaying comprises techniques used to create friction within a climbing protection system, particularly on a climbing rope, so that a falling climber does not fall very far. A climbing partner typically applies tension at the other end of the rope whenever the climber is not moving, and removes the tension from the rope whenever the climber needs more rope to continue climbing. The belay is the place where the belayer is anchored, which is typically on the ground, or on ledge (where it is also called a belay station) but may also be a hanging belay where the belayer themself is suspended from an anchor in the rock on a multi-pitch climb.

In climbing, a pitch is a section of a climbing route between two belay points (or belay stations), and is most commonly related to the task of lead climbing (going up), but is also related to abseiling (going down). Climbing on routes that require only one pitch is known as single-pitch climbing, and climbing on routes with more than one pitch is known as multi-pitch climbing (where the number is large, it can be big wall or alpine climbing).

Modern climbing ropes are typically 60–70 metres (200–230 ft) in length, which sets the theoretical maximum length of a 'pitch', however, other factors mean that the average pitch on a multi-pitch route is circa 30–40 metres (98–131 ft) in length. Advanced climbing techniques such as simul climbing can materially reduce—and even completely remove—the need for 'pitches' on a multi-pitch climbing route. The term is also used in caving.