Why are my disc brakes squeaking and how can I fix the issue?

Disc brakes can squeak due to various reasons such as contamination, worn brake pads, or misalignment. To fix the issue, you can try cleaning the brake components, replacing the brake pads if they are worn out, or adjusting the alignment of the brake calipers. If the problem persists, it is recommended to consult a professional mechanic for further inspection and repair.