VEVOR Plasma Cutter, 50Amp, Non-Touch Pilot Arc Air Cutting Machine with Torch, 110V/220V Dual Voltage AC IGBT Inverter Metal Cutting Equipment for 1/2" Clean Cut Aluminum and Stainless Steel

Yes, you really need an air compressor: connect the air from the air compressor to the inlet end of the pressure reducing valve, and connect the outlet end of the pressure reducing valve to the air inlet of the machine.

Absolutely YES, you need an air compressor lol. This is a Plasma Cutter. It requires compressed air to blow the plasma out (cut)

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