I work in a tearoom, A white Americano is a shot of coffee with water and cold milk. A Latte is Hot frothy milk served around 80 degrees to kill any bacteria in the milk then with a shot of coffee on top. Some people will chose to add a syrup in before the milk is put in.A latte is a drink with a small amount of espresso (typically 1-3 shots), mostly steamed milk (typically 8-18 ounces), and a small portion of steamed milk foam on top. . A Americano is essentially watered down espresso. It's 2-4 shots of espresso and hot water. You can sweeten and dairy it up like a cup of coffee. Hope this helps!