what motor driver for servo motor?
This is a hobby servo for remote controlled models.  It has got its own motor driver on board, and a closed loop controller.  It's self-contained.  It only requires DC power and the control signal.

Further reading


Hobby servo tutorial written by Sparkfun  
In the industry servomotor means a motor coupled with a sensor for position feedback.  An industrial servomotor typically requires an external driver and controller.