A motor driver is an electronic device that controls the operation of a motor, allowing it to start, stop, and change speed or direction. It acts as an interface between a microcontroller, like an Arduino, and the motor, providing the necessary power and control signals. Motor drivers are essential for applications in robotics, automation, and various electronic projects. There are different types of motor drivers, including H-bridge drivers for DC motors and stepper motor drivers for precise control. These drivers can handle varying voltage and current levels, ensuring that the motor operates efficiently and safely. Proper selection of a motor driver is crucial for achieving desired performance in any project.