The Servo motor comprises of the three-wire system known as Power, Ground and Control whereas DC motor is a two-wire system known as Power and Ground. Servo motor has an assembly of four things DC motor, gearing set, control circuit and a position sensor. DC Motor does not comprise of any assembly. Servo motor does not rotate freely and continuously like DC motor. Its rotation is limited to 180⁰ whereas DC motor rotates continuously. Servo motors are used in robotic arms, legs or rudder control system and toy cars. DC motors are used in fans, car wheels, etc.