What is the purpose of aerating milk in the steaming process?

Aerating milk during the steaming process is essential for creating microfoam, which is a fine, velvety texture of frothed milk. This is achieved by introducing air into the milk as it is steamed, allowing for the formation of tiny bubbles. The microfoam produced is crucial for crafting beverages like lattes and cappuccinos, as it contributes to both the texture and visual appeal of the drinks. The lightness and creamy consistency of microfoam enhance the overall mouthfeel, making the beverage more enjoyable. Additionally, this process also aids in the incorporation of the milk's natural sweetness, enhancing the flavor profile of the drink.