The traditional alcoholic beverage made from fermented grain is beer. Beer is typically produced by fermenting sugars derived from cereal grains such as barley, wheat, corn, or rice. The brewing process involves mashing the grains to extract their sugars, boiling the mixture with hops for flavor and aroma, and then fermenting it with yeast, which converts the sugars into alcohol and carbon dioxide. Beer has a long history, dating back thousands of years, and it is one of the oldest fermented beverages. Varieties of beer include lagers, ales, stouts, and IPAs, each differing in taste, alcohol content, and brewing techniques.