What is the significance of the milk in a macchiato?

The significance of milk in a macchiato lies primarily in its role in creating the classic macchiato texture. When milk is added to the espresso, it creates a layered effect that enhances the drink's overall mouthfeel, providing a balance between the strong flavor of the espresso and the smoothness of the milk. This combination results in a distinct texture that sets a macchiato apart from a straight espresso.

While it is true that milk can add some flavor and may slightly cool the drink, its primary contribution is the alteration of the texture, which is crucial in delivering the intended experience of enjoying a macchiato. Thus, the texture created by the incorporation of milk is a defining characteristic of this beverage.