What is a servo motor and where is it used?

A servo motor is a rotary actuator that allows precise control of angular position, velocity, and acceleration. It combines a motor with a position feedback device (encoder or resolver) and controller. The control system continuously compares actual position to commanded position and corrects errors. Servo motors are used in robotics, CNC machines, automation systems, and anywhere precise motion control is required. Both AC and DC servo motors are available.