A PWM Controller (Pulse Width Modulation Controller) is an electronic device that regulates the power supplied to electrical devices by varying the width of the pulses in a signal. This technique allows for efficient control of voltage and current, making it ideal for applications like motor speed control, LED dimming, and power supply regulation. By adjusting the duty cycle, which is the ratio of the "on" time to the total cycle time, a PWM controller can effectively manage energy consumption. This method is widely used in various fields, including automotive systems, industrial automation, and consumer electronics, to enhance performance and reduce energy waste.