Superchargers and Turbochargers work by using a compressor to get extra air into the engine. More air means more oxygen means more effective combustion means more power.
They work separately though. A supercharger uses a compressor that is driven by a belt directly hooked to the engine, while a turbocharger uses the engine exhaust to power the compressor.
This means that a supercharger is taking some of the power directly created by the engine to produce the effect, while a turbocharger uses otherwise wasted energy.
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