What does the Lane Departure Warning feature in the Audi A1 do?

I've noticed the Lane Departure Warning symbol on my Audi A1's dashboard, but I'm not sure how it works or if I should be concerned. Can someone explain what exactly this feature does and how it helps with safe driving?

The purpose of the Lane Departure Warning feature in your Audi A1 is to help prevent unintentional drifting out of your lane while driving. It uses cameras or sensors to monitor the lane markings on the road and will alert you if you begin to drift without using a turn signal. This can be especially useful on long drives or in low visibility conditions.