Comfort and Convenience
The on-board computer matters most mid-journey, when it gathers data from vehicle sensors and presents readings such as consumption or range, so the driver learns about a developing situation without stopping to check.
Safety and Driver Assistance
The anti-lock braking system protects rather than informs: it senses a wheel about to lock under hard braking and releases pressure in rapid pulses, so the tyre keeps turning and steering input still has effect.
Multimedia and Connectivity
The audio system is the playback side — amplifier and speakers that turn a signal into sound in the cabin. The AUX input is only one way of delivering that signal from an external player.