The espresso, also known as a short black, is approximately 1 oz. of highly concentrated coffee. Although simple in appearance, it can be difficult to master.
A double espresso may also be listed as doppio, which is the Italian word for double. This drink is highly concentrated and strong.
The red eye's purpose is to add a boost of caffeine to your standard cup of coffee.
The black eye is just the doubled version of the red eye and is very high in caffeine.
The water dilutes the espresso while still maintaining a high level of caffeine.
The long black is a similar coffee drink to the americano, but it originated in New Zealand and Australia. It generally has more crema than an americano.
The word macchiato means mark or stain. This is in reference to the mark that steamed milk leaves on the surface of the espresso as it is dashed into the drink