TIA
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Your question is way too vague, tuning can refer to a myriad of things. What most people refer to is tuning an engine, which is to say, try to make it make more power. To do that you try to force as much oxygen and fuel inside it as possible, and regulate when the sparkplugs fire to explode the mixture. There are a ton of ways of achieving that, like getting colder air into the engine, making the valves open more and for longer with a different camshaft, increasing the rev limiter, increasing intake pressure if the engine is turbocharged, and about a thousand more ways to do so. You can also tune suspension, to get the car to adhere better to the ground.
In the most basic sense, tuning a car is getting it to do exactly what you want, in the best possible way, when you tell it to do so. Be it rolling while cornering, accelerating, braking, clutching, or whatever else.
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