A person called a "tuner" here would take a computer, plug it into a special plug in your car under the dash board, and change the cars own internal computer slightly. The "tune" as it is called may get the proper air and fuel mixture in your engine so the spark burns hotter and creates more horsepower. It can give you a little more power from the stock engine without buying or installing any actual parts on the car. It may also smooth a few things out like your engine idle and some other things.
I had a "tuner" here in Florida tune up my car and I went from 405 horse power to about 431 horse power, all from the factory C5 Z06 motor.
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