What are the differences between caf au lait and cappuccino in terms of their ingredients and preparation methods?

Caf au lait is made with equal parts of coffee and hot milk, while cappuccino is made with espresso, steamed milk, and milk foam. Caf au lait is typically prepared by brewing coffee and heating milk separately, then combining them, while cappuccino is made by combining espresso with steamed milk and milk foam in specific proportions.