What is Lane Departure Warning and How Does it Work on the Audi A1?

I'm interested in buying an Audi A1, but I keep hearing about Lane Departure Warning. Can someone explain what it does and how it works?

Lane Departure Warning is a safety feature that uses cameras to detect if you are veering out of your lane without signaling. If you start to drift, it will alert you with a sound or vibration so you can correct your steering.

It works by analyzing the lane markings on the road and comparing them to your vehicle's position. If there is a discrepancy, it will warn you. It's a great safety feature for long drives or when you're feeling tired.