An Americano coffee is made by diluting espresso with hot water. It is like a regular cup of drip coffee in terms of flavor and strength, but it has a richer, more full-bodied taste due to the addition of the espresso.
To make an Americano, a barista will start by pulling a shot or two of espresso. The espresso is added to a cup and hot water is poured over the espresso, usually in a ratio of about 1 part espresso to 3 parts waters. The result is a coffee that has a strong, bold flavor and a smooth, velvety texture.
A lot of people prefer Americanos to regular drip coffee because they feel that the espresso adds depth and complexity to the flavor, while others prefer the brighter, more acidic taste of drip coffee. It comes down to personal preference.