1) Type of climbing 
Aid climbing is a style of climbing in which standing on or pulling oneself up via devices attached to fixed or placed protection is used to make upward progress. The term contrasts with free climbing in which progress is made without weighting artificial aids: a free climber ascends by only holding onto and stepping on natural features of the roc...
Aid climbing is any type of climbing that requires equipment or objects to be used into the rock which will help the climber progress up the wall or rock.
A type of climbing that makes use of rope, fixed bolts, pitons or foot slings, rather than features on the rock itself, to ascend the face. Opposite of free climbing.