Milk foam is a light and airy substance created by incorporating air into heated milk. It is commonly used in beverages like lattes and cappuccinos, where it adds a creamy texture and enhances the overall flavor. The process of making milk foam involves steaming the milk, which heats it while also introducing air, resulting in tiny bubbles. There are different types of milk foam, including microfoam and dry foam. Microfoam is velvety and smooth, ideal for latte art, while dry foam is stiffer and used for topping drinks. The quality of milk and the technique used can significantly affect the foam's texture and stability.