Comfort and Convenience
The on-board computer matters mid-journey: it reads running data such as fuel use and trip distance from the vehicle's sensors and shows it on the display, so refuelling stops can be judged while driving.
Safety and Driver Assistance
ABS acts during hard braking, when a wheel is about to lock. It releases and reapplies pressure at that wheel in rapid pulses, so the tyre keeps rolling and steering input still turns the car.
Multimedia and Connectivity
The audio system supplies the amplification and speakers, turning a signal from radio, USB or a paired phone into cabin sound, with volume and source handled from the dashboard head unit.