What is the cause of the high pitch squeaking noise coming from my Audi A2's front brakes?

I recently noticed a high pitch squeaking noise coming from my Audi A2's front brakes when I press the pedal. It seems to happen more often when I am braking at slow speeds or coming to a stop. What could be causing this and how can I fix it?

The most likely cause of this noise is worn brake pads. As the brake pads wear down, they can start to make a squeaking sound when they come in contact with the rotors. It is important to get your brake pads checked and replaced if necessary to avoid further damage to your vehicle.