Stepper motors are everywhere. For example, every computer contains several (in the floppy and hard disk drives - one popular hobbyist source). They're used because it is easy to achieve very precise positional control - far better than you can achieve with a "normal" motor (if you can control it at all).

Unlike a conventional motor, where you simply connect an appropriate voltage and "away she spins", stepper motors require considerably more effort to get them to work.

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