What is Audi pre sense city in the Audi A6?

I've heard that the Audi A6 has an advanced safety feature called Audi pre sense city. Can you explain what it does and how it works?

Audi pre sense city is an active safety feature that uses sensors and cameras to detect potential collisions in urban traffic settings.

When a potential collision is detected, Audi pre sense city can provide visual and audio warnings, and even apply emergency braking if necessary.