A servo (short for servo motor or servomechanism) is a device used to control motion and position with high precision. It consists of a motor, a control circuit, a position sensor (usually a potentiometer in basic servos), and a feedback system that helps it maintain accuracy.
A popular and affordable 9g micro servo. Uses nylon (plastic) gears, making it lightweight but less durable than metal gear servos. Operates at 4.8V to 6V with a typical torque of about 1.8 kg·cm at 6V. Suitable for lightweight applications like small robotic arms, pan-tilt mechanisms, and model planes.