What component is usually not found in an Americano?

An Americano is typically made by diluting espresso with hot water, which creates a beverage that preserves the espresso flavor while reducing its intensity. The main components are espresso and water. While some variations may include milk, the classic preparation of an Americano does not include milk or foam.

Foam is not typically a component of an Americano. It is primarily associated with drinks like cappuccinos or lattes, where steamed milk is used, and foam tops the beverage. Therefore, foam is absent in a traditional Americano, making it the correct choice in this context.