What does c230 kompressor means?

"C230 Kompressor" is Mercedes' shorthand modeling code for a C-class vehicle (a small/compact size) with a 2.3 liter "straight 4" (i.e., an in-line 4 cylinder) supercharged engine.

There's a pretty good definition of what supercharging means at

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"This is a mechanism that pressurizes air to increase engine power, but unlike a turbocharger it is driven by a belt or gearing and thus though stronger, is more complex."

Supercharging the engine boosts the horsepower from about 150 to 193 and torque around 30 kW according to: http://en.wikipedia.org/wiki/Mercedes-Benz_C-Class