What could be causing a squeaking noise in my Audi A3?

I recently noticed a squeaking noise coming from my Audi A3 when I apply the brakes. It only happens sporadically, but it's starting to become more frequent. What could be the potential causes of this noise and what should I do to fix it?

The most common cause of squeaking noises in a car is worn brake pads. It's important to have them checked and replaced if needed to ensure your safety on the road.

Another potential cause could be a loose or damaged belt in the engine. You should have it checked by a mechanic to avoid any further damage to your car.