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ESC stands for "Electronic Speed Controller", which is a device used to control the speed and direction of an RC car. The ESC regulates the power to the motor by controlling the amount of electricity flowing from the battery to the motor. It acts as a translator, interpreting the signals from the transmitter and converting them into specific motor movements. The ESC adjusts the timing and frequency of the electric current to the motor, which in turn controls the speed and direction of the car. It also helps to protect the motor from damage by providing overcurrent and overheat protection. The ESC is an essential component of an RC car, as it helps to optimize the performance of the motor and provides a smoother and more precise driving experience.