How does the MMI System in the Audi A1 work?

I'm considering purchasing an Audi A1 and I keep hearing about the MMI system but don't quite understand what it is or how it works. Could someone please explain it to me in a simple and straightforward way?

The MMI system in the Audi A1 is essentially the vehicle's central control system for all multimedia and navigation functions.

The system consists of a central rotating control dial, touchpad, and a series of buttons and switches on the center console.

To use the MMI system, simply rotate and push the control dial for menu navigation, use the touchpad for handwriting inputs, and press the buttons for quick access to certain functions.