Why does my Audi A1 produce a rattling noise when idling?

I recently bought an Audi A1 and noticed that it produces a rattling noise when idling. It disappears when I start driving, but comes back when the car comes to a stop. What could be causing this and should I be concerned?

The rattling noise is most likely coming from loose components in the engine, such as a heat shield, exhaust system, or timing chain. It is not a cause for concern, but it is best to have it checked by a mechanic to prevent any further damage.