Which beverage is known primarily for being served hot?

Steamed milk is prominently known for being served hot, as it is a key component in many espresso-based drinks, such as lattes and cappuccinos. The steaming process not only heats the milk but also incorporates air, creating a velvety texture and enhancing the overall flavor profile of the beverage. Steamed milk provides warmth and richness, making it a preferred choice for customers looking for comforting, hot beverages.

In contrast, cold milk, caramel apple juice, and sparkling water are typically served cold, aligning them more with refreshing drinks rather than the hot beverage category. Cold milk is usually used in iced drinks, while caramel apple juice is often enjoyed chilled, and sparkling water is, by definition, a refreshing, non-heated beverage. This distinction highlights steamed milk's unique role in serving hot beverages at Starbucks.