Guinness is a type of ale known as stout. It is brewed from barley, hops, water, and a special strain of yeast, with the barley being roasted to give Guinness its characteristic dark color and rich flavor. It is known for its smooth and creamy finish, achieved by introducing nitrogen during the brewing process. Guinness comes in several varieties, with the most iconic being Guinness Draught, a smooth stout with a distinctive ruby red color and creamy head. Other types include Guinness Foreign Extra Stout and Guinness Extra Stout, among others.