TC (Traction Control) and Electronic Stability Control systems, on current production vehicles, are typically (but not necessarily) electro-hydraulic systems designed to prevent loss of control when excessive throttle or steering is applied by the driver.
The intervention can consist of any, or all, of the following:

Retard or suppress the spark to one or more cylinders
Reduce fuel supply to one or more cylinders
Brake one or more wheels
Close the throttle, if the vehicle is fitted with drive by wire throttle.

Traction Control is usually considered as a performance enhancement, allowing maximum traction under acceleration without wheel spin. It is also extremely useful in countries that suffer from icy or snowy roads: When driving up a slippery hill, giving full gas and letting the car's TCS take care of the throttle control will allow to scale slopes that are nigh-on impossible without TCS.


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