What is Audi A6's adaptive cruise control and how does it work?

I've heard about Audi A6's adaptive cruise control but I'm not sure what it does and how it works. Can someone explain it to me in simple terms?

Audi A6's adaptive cruise control is a driver-assistance feature that uses radar or camera sensors to maintain a set distance from the vehicle in front of you. It automatically adjusts your car's speed and braking to keep a safe following distance, taking some of the stress out of driving on highways and in traffic.

Adaptive cruise control in Audi A6 can also be paired with traffic jam assist, which can take over steering at speeds up to 37 mph. This feature is especially useful for stop-and-go traffic, reducing the driver's workload and making the commute more relaxed.