An actuator is a type of motor that is responsible for moving or controlling a mechanism or system. The most common types of actuators are DC motors and servos. Motors are mostly used when circular motions are needed, but can also be used for linear applications and some actuators are intrinsically linear, such as piezoelectric actuators. As we all know motors have a wide range of applications in industries, automobiles and a lot more. Servos find application industrial and in locomotion of robots. Devices such as magnetic solenoids that convert electricity into motion but do not generate usable mechanical power are also referred to as actuators.