A driver circuit is required to properly operate a DC motor or servomotor. DC motors can be controlled to operate in any of the four quadrants. Servomotors allow for precise control of position and velocity through feedback sensors and sophisticated controllers. Common types of motors discussed include DC motors, AC induction motors, stepper motors, and brushless DC motors. Brushless DC motors are increasingly used due to their higher efficiency, longer lifespan, lower noise, and ability to achieve precise motion control compared to brushed DC motors.