Why is my Audi A5's engine overheating?

I've noticed that my Audi A5's engine has been overheating recently. The temperature gauge in the dashboard shows that it's reaching dangerous levels. What could be causing this and what steps should I take to resolve it?

It's possible that your coolant levels are low. Check the coolant reservoir and add more if necessary.

Another possible cause could be a faulty thermostat. Have it replaced if needed.

Check the radiator for any debris or dirt that could be blocking proper air flow. Clean it out if necessary.