What is supercharger and turbocharger

A supercharger on a gasoline engine is both a pump and compressor. It takes in more normal air through the air filter than the engine can use and pumps it through the scrolls inside the housing. Because it is turning faster than the engine and it is pumping far more air than in than the engine can use that air compresses inside the engines intake manifold. Then when an intake valve opens that higher pressure air rushes in and packs the cylinder. When the fuel is injected and the cylinder fires that extra air expands farther than "normal non-supercharged" air will expand. This gives you more power.

A turbocharger does the same thing, it just uses a different power source to turn it.