What should I do if my Audi A4's engine is overheating?

I noticed that my Audi A4's temperature gauge is constantly in the red zone and there is steam coming out from under the hood. What could be causing this issue and how can I fix it?

If your Audi A4's engine is overheating, it could be due to a variety of reasons such as a faulty coolant system, low coolant levels, or a malfunctioning thermostat. It is important to address this issue immediately to avoid further damage to your engine.