<human>:  What are the differences between various types of motors?
<bot>: The main difference between various types of motors is their power source. Electric motors are powered by electricity while internal combustion engines are powered by fuel such as gasoline or diesel. Additionally, some motors, such as stepper motors, are designed to move a specific number of degrees or steps in response to a digital pulse signal. Motors can also be distinguished by their size, maximum output, RPMs, efficiency, and torque.