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motor controller

look ,iknow it`s a stupid question ,but i want to know waht is the motor controller? ,and what is its use?

replies please ...... 

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The term "motor controller" or "motor driver" refers to a circuit that it's designed to drive motors. 

Such a circuit is the L293D from ST which is a dual H-Bridge circuit. This means that it can drive two DC motors at the same time and allows the switching of the direction the motor turns, by logical inputs. It has a separate power supply for the motors, and it can be used with PWM in order to control the speed.