A stepper motor is called so because it moves in discrete steps, or "steps," rather than in a continuous motion. Each step corresponds to a specific angular rotation, which allows the motor to precisely control its position. This stepping action is achieved through the sequential energizing of its coils, making it possible to achieve accurate control over rotation and position without the need for feedback mechanisms.
The stepping action is a key feature that differentiates stepper motors from other types of motors, like DC motors or AC motors, which typically rotate continuously and require additional control systems for precise positioning.