A stepper motor (or step motor) is a brushless DC electric motor that divides a full rotation into a number of equal steps. The motor's position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller), as long as the motor is carefully sized to the application.
Switched reluctance motors are very large stepping motors with a reduced pole count, and generally are closed-loop commutated.
Read more about Stepper Motor: Fundamentals of Operation, Types, Two-phase Stepper Motors, Higher-phase Count Stepper Motors, Stepper Motor Drive Circuits, Phase Current Waveforms, Theory, Stepper Motor Ratings and Specifications, Applications, Stepper Motor System
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“This biplane is the shape of human flight.
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—Robert Frost (1874–1963)