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A fan moves large amounts of gas with a low increase in pressure: you'll find these in your home.

A blower is a machine used for moving gas with a moderate increase of pressure: a more powerful fan, if you will. By changing the angle of the blades, a blower will be able to push air in any direction you want it.

A compressor is a machine for raising gas to a higher level of pressure, actually making the air denser by cramming air into a small space.