In reply to Tom1991:
Hi Tom
Yep that's a stupid question but don't worry we all asked it once
Most walls offer 4 types of climbing, lead climbing, top roping, auto belays and bouldering. Lead and top roping both require some training and a friend to belay you. Auto belays can be used on your own but often require a 20 minute induction course, just ask about this at the desk. Bouldering is climbing not very high without ropes above mats, it can (and frequently is) done by any old plonker.
Hope that helps, just ask if you're stuck.