Why are my bike's brakes squeaking and how can I fix the squeaky brakes issue?

Your bike's brakes may be squeaking due to dirt or debris on the brake pads or rims, misalignment of the brake pads, or worn brake pads. To fix the squeaky brakes issue, you can try cleaning the brake pads and rims, adjusting the brake pad alignment, or replacing the brake pads if they are worn out.