What sets bourbon apart from other whiskeys is its distinct production and aging process. Whiskey is made from fermented grains and aged in barrels, but it's the specific type of grain and barrel used that determines the variety of whiskey. The American Bourbon Association requires bourbon to be distilled from a blend of grains that is at least 51% corn to be classified as such. This gives bourbon its one-of-a-kind and delightful taste.