A variable frequency drive (VFD) is an electronic device that controls the speed and torque of an electric motor by varying the frequency and voltage of its power supply. By adjusting these parameters, VFDs enable motors to operate more efficiently, reducing energy consumption and wear on mechanical components. VFDs are commonly used in various applications, including pumps, fans, and conveyors. They help improve process control and can lead to significant cost savings in industries such as manufacturing and HVAC (heating, ventilation, and air conditioning).