Why is the engine of my Audi making strange noises?

I have noticed some unusual sounds coming from my car's engine while driving. They are not constant and seem to come and go randomly. What could be causing this and how can I fix it?

It sounds like you may have a faulty or loose belt in your engine. This can make clicking or squealing noises as the engine rotates. It is important to have this checked and replaced if necessary to prevent any further damage to your car.