What is the purpose of the Audi A2's active lane assist feature?

I recently purchased an Audi A2 and noticed it has an active lane assist feature. Can you explain how this feature works and what its purpose is?

The active lane assist feature uses sensors to detect the lane markings and assists with steering to keep the vehicle centered within the lane. It is especially useful for long highway drives.

Active lane assist is a safety feature that helps prevent lane drift and potential accidents. It is especially helpful for tired or distracted drivers.