A traction control light is a warning sign that shows up on a car's dashboard when the traction control system (TCS) is on or when something is wrong with the system. Traction control is a safety feature that helps keep the wheels from slipping when accelerating by applying the brakes to individual wheels or decreasing engine power.
When the traction control system is turned on, a "traction control" light will come on in the dashboard. This usually happens when the car's sensors see that one or more wheels are slipping or spinning faster than the others. Then, the TCS will step in and apply the brakes or cut the power to the engine to stop the wheels from spinning and improve traction.
If the traction control light stays on after you turn the system on, it could mean that something is wrong with the system. This could be because a sensor is broken or the TCS module isn't working right. In this case, it would be best to have a qualified mechanic look at the car to figure out what's wrong and fix it.