The difference between a fader and a normal potentiometer lies in the sliders of about 10 cm length, which offer more precise adjustment possibilities than the rotary movement of a potentiometer. For precise adjustment, scales are printed in the direction of the slider, and the slider knob itself has a marker with which it can be pushed to a specific position.
In audio, faders are in tandem designs for stereo and have a logarithmic resistance curve that adapts to human hearing characteristics. Faders are used in control rooms and mixing consoles and are operated by hand, but they can also be motor-controlled. The advantage of motor-controlled faders is the electronic adjustability and the reproducibility of the settings.