What ingredient is commonly added to enhance the richness of coffee drinks?

Whipped cream is often added to coffee drinks to enhance their richness and create a creamy texture. This ingredient not only contributes a luxurious mouthfeel but also adds a layer of sweetness and flavor that complements the coffee. The combination of rich coffee and the airy texture of whipped cream can elevate the overall drinking experience, making it more indulgent.

In contrast, while filtered water is essential for brewing coffee, it does not add richness; sugar enhances sweetness rather than creaminess; and ice would typically dilute the coffee, potentially reducing its richness. Therefore, whipped cream is the ingredient most associated with adding a rich, creamy component to coffee beverages.