@SkyWhisperer - I understand the industrial application of the term, but when I think of robots, I think of the humanoid type machines that can walk and see.
There are already such machines out there, especially in Japan where companies like Honda have made their own walking robots that can climb steps.
I’m assuming that these machines would have to use a combination of all the different kinds of motors described here. I believe the servo motors would be suitable for arm and leg movements. And to get the robot to turn around (without losing balance) I think it would need a stepper motor to take small steps.