ORIGINAL: sensei
Aircraft also make use of the rudder during cross-wind landings. During a cross-wind landing, the aircraft obviously must point the nose to the upwind side slightly in order to maintain alignment with the runway. Think of rowing a canoe across a fast-moving stream. You would need to point the canoe up-stream in order to cross the stream directly, otherwise you will wind up downstream. In a cross-wind landing, the pilot must maintain this up-wind pointed angle (crab angle) all the way down the glideslope until immediately before touchdown. Right before touchdown, the pilot must use the rudder to align the aircraft heading with the runway heading.
You don't make it explicit so it may be misunderstood by the rudder abusers, I am sure what you meant to say is that the pilot makes the upwind pointed angle by turning the plane in the normal manner with ailerons, and not by holding on rudder into the wind.