Bourbon whiskey is a type of American whiskey that must be made from at least 51% corn. It is typically aged in new charred oak barrels, which gives it a distinct flavor profile that includes notes of vanilla, caramel, and oak. To be labeled as bourbon, it must be produced in the United States and meet specific legal requirements. The production process of bourbon involves mashing, fermenting, distilling, and aging. The whiskey is usually distilled to no more than 160 proof and entered into barrels at no more than 125 proof. Kentucky is the most famous region for bourbon production, although it can be made anywhere in the U.S.