A ski course is a type of downhill skiing event that involves navigating a set of gates or flags. SLALOM is a type of ski course in which the skier must navigate between poles or flags spaced more closely together than in other types of ski courses. TRAIL is another type of ski course in which the skier must navigate a winding path down the mountain. SCHUSS is a type of ski course in which the skier must travel in a straight line down the mountain at high speed.