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it does not use exaust gas to work itself. instead they are belt driven. as the engine turns its crank, so does the pulley thats on the supercharger.
there are different kinds of superchargers. the one you seen probably was a twin root/twin screw type of charger.
a supercharger is a blower. a turbercharger is a blower. both are blowers. some superchargers such as the centrifugal type supercharger looks like a turbo, and acts like a turbo too! except its driven by the belt instead of the exaust.
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