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A popcorn machine is a device that uses heat (oil or hot air) to rapidly expand popcorn kernels, creating the fluffy snack, featuring components like a kettle, heating elements, motor, and often tempered glass/steel housing with lights, designed for efficiency in producing large batches quickly for theaters, events, or home use. They range from small home poppers to large commercial units, all relying on the internal moisture of the corn kernel turning to steam and bursting.