A servo motor is a geared DC motor attached to a potentiometer. It has leads for power, ground and signal. The pulse width of the signal instructs the motor to turn until it reaches the correspondant position on the potentiometer. Thus, they have absolute positioning but less than 360° of rotation (usually around 200°).
Futaba Standard Rotation (Parallax)
Power: 4 - 6V
Torque: 2.4 - 3.0kg*cm
Sub-Micro 3.7g (Pololu)
Power: ~4.8V
Torque: 0.6kg*cm
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