Why is my Audi A3 engine making a high-pitched whining noise while accelerating?

I have noticed that whenever I press down on the accelerator, my Audi A3 makes a high-pitched whining noise. It doesn't seem to affect the performance of my car, but it's definitely worrying. What could be causing this and how can I fix it?

This high-pitched whining noise is most likely coming from a worn-out serpentine belt. The belt is an essential part of your engine that helps power crucial components such as the alternator, air conditioning compressor, and power steering system. It's important to have it checked and replaced if necessary to avoid any potential breakdowns.