Why do I keep hearing a rattling noise from my Audi A6?

I've noticed a rattling noise coming from my Audi A6 whenever I start the engine or hit a bump on the road. Does anyone know what could be causing this and if it's something I should be concerned about?

It's likely that the rattling noise is coming from the exhaust system. This could be due to a loose or damaged component, such as a heat shield or exhaust pipe. It's important to get this checked by a mechanic as it could cause further damage or even pose a safety hazard.