Rock climbing involves climbing on rock faces, usually with some form of protection from falling to the ground. Disciplines include traditional climbing, sport climbing, free climbing & deep water soloing.
Rock climbing

Ice climbing involves climbing on ice-covered rock & frozen water features using specially designed ice axes & crampons - giving the climber the added challenge of understanding ice formations.
Ice climbing

Bouldering involves climbing on the lower parts of rock faces and boulders, often with no form of protection from falling to the ground - just a friend and/or a mat to cushion the blow!
Bouldering

Wall climbing refers to climbing on indoor walls - a great place to learn the basics of climbing before taking to the crag and a key part of climbing in the UK given the weather.
Wall climbing

Scrambling involves a mix of hill walking and easy rock climbing, sometimes (but not always) involving sufficient exposure to falling to warrant rope protection.
Scrambling

Mountaineering can involve a mix of hill walking, scrambling, rock climbing and ice climbing - all in one trip. Mountaineers also require navigation and weather skills.
Mountaineering