Here you can get a wide range of motor drivers: stepper motor drivers brushed DC motor drivers and Servo Motor Driver. Motor drivers act as an interface between the motors and the control circuits. The motor requires a high amount of current whereas the controller circuit works on low current signals.
So the function of motor drivers is to take a low-current control signal and then turn it into a higher-current signal that can drive a motor. stepper motor with driver is the driver circuit that controls how the stepper motor operates. Stepper drives work by sending current through various phases in pulses to the stepper motor.