Engines will generate more power if they can burn more fuel, but because of the way combustion works you need to add more air in proportion to the amount of extra fuel you use.
To get the extra air into your engine you need to use an air pump. Both turbochargers and superchargers are air pumps.
Superchargers have their pump mechanism driven mechanically via a belt directly from the engine’s crankshaft.
Turbochargers use the engine exhaust gases to turn a turbine to drive the air pump.
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