What is meant by supercharger & turbo charger ?

Both are used to increase the volumetric efficiency of an engine by the method of forced induction. The method is based on the principle that an engine will produce more power at the same speed if more air-fuel mixture is forced into it.. This means higher pressure during power stroke and higher power output.
Superchargers and Turbochargers are two pumps or blowers that force more air-fuel mixture in the cylinder. They both differ in construction and operation but the basic difference:
Supercharger: This is mechanically driven by belt/chain from engine crankshaft. Noisy and poor economy. Was used extensively earlier. Does not have problem of turbo lag therefore is still used for some high performance engines. Instant response when accelerator is pressed. Unlike turbocharger, does not turn at high speeds. New designs have improved economy and lessened noise.
Turbocharger: A centrifugal pump driven by the engine exhaust gases. Prone to detonation because of higher peak cylinder pressure, therefore compression ratios have to be reduced, this results in lower air standard efficiency. Limited use in Petrol Engine but is extensively used in Diesel Engine because - increase in power output, better torque characteristics, more B.P/weight ratio, power loss due to decrease in air density at higher altitudes reduced, reduced gas emission.

Moved thread to Mechanical and Automobile Section

The supercharger, piston aircraft engine so as to increase cylinder the inlet pressure device

Actually hot or cold side turbochargers are way more common in usage in gas vehicles than superchargers. Both means of FI require alteration on the vehicle's ECU to remap the air-fuel ratio & to avoid knocking from pre-detonation which can damage the engine internals. S/C offer a very linear almost all-time boost where as turbos have an rpm based spooling effect and use a wate gate and BOV (blow off valve) to equalize.