What is the purpose of the foam in an iced cappuccino?

The foam in an iced cappuccino serves the purpose of providing texture to the drink. When prepared correctly, the foam creates a light and airy consistency that contrasts with the liquid components of the beverage. This texture enhances the overall drinking experience, making it feel more substantial and satisfying. The frothy layer also helps to insulate the drink, keeping it cooler for a longer period.

While foam can contribute to the overall mouthfeel and perception of creaminess, it does not primarily add sweetness or flavor. Instead, the ingredients that typically provide sweetness and flavor are the espresso and any syrups or flavorings added to the drink. Additionally, the foam does not serve a functional role in covering the drink but rather acts as a delightful topping that invites enjoyment.