Jog wheels are knobs typically incorporated into professional DJ, audio mixing, and video editing equipment. Also known as a shuttle wheel, shuttle dial, and jog dial, this type of knob helps professionals jog or shuttle through media in a more convenient way.
In this context, "jogging" stands for going over media content at low speeds, whereas "shuttling" represents the opposite. Jog wheels can be quite useful when editing audio and video, as well as for recordings and live performances, facilitating different effects.
In terms of music, the original idea behind jog wheels was to allow for DJs working with digital content to operate much like they would with vinyl turntables. With most jog wheels, DJs can pause, scratch, and cue music backward and forward, adjusting the playing speed.