The concept in turbo and supercharging are basically the same: forcing air into the combustion chamber, which speeds up the compression burning process resulting in faster revolution of the motor. The difference actually has its pros and cons. The basic difference is the way the compressor is powered to spool air. In a supercharger, the compressor is driven by the crankshaft pulley. The faster the motor is turning, the more air is being forced. The good part about this is that there's no "lag." Forced induction begins right when the car is started. The con is that the supercharger puts out as much power as the motor can turn. In a turbocharger, the compressor is driven from the exhaust. Once exhaust gases leave the exhaust manifold, it re-circulates into the turbine which spins the compressor. An advantage of a turbo is that it's not as limited; the more exhaust pushed through, the faster the compressor. The con is that it takes a good amount of exhaust air to spin the turbine to catch up to the amount of air needed to start off. Since there's no straight breathing of the motor, it relies on the turbo to feed it air. This is when the turbo "lags."

Info from the net of course, hope this helps.

Regards,
JIMMY