A motor controller is an electronic device that manages the operation of an electric motor. It regulates the motor's speed, direction, and torque by adjusting the electrical input. Motor controllers are essential in various applications, including robotics, electric vehicles, and industrial machinery. These controllers can be classified into different types, such as DC motor controllers, AC motor controllers, and servo motor controllers. Each type is designed to work with specific motor types and applications, ensuring efficient and precise control over the motor's performance.