A servo, short for servomechanism, is a device that uses feedback to control the position, speed, or acceleration of a mechanical system. It typically consists of a motor, a sensor, and a controller. Servos are commonly used in applications like robotics, remote-controlled vehicles, and industrial machinery to achieve precise movements. These devices operate by receiving a signal that indicates the desired position or speed. The controller processes this signal and adjusts the motor accordingly, while the sensor provides real-time feedback to ensure accuracy. This closed-loop system allows servos to perform tasks with high precision and reliability.