The main ingredient in whiskey is grain. Various types of grains can be used, including barley, corn, rye, and wheat. The type and combination of grains significantly influence the flavor profile and character of the whiskey. The grains undergo mashing, fermentation, distillation, and aging processes to develop the final spirit. Different styles of whiskey, such as Scotch and bourbon, use specific grains and methods of production, all contributing to their unique tastes and aromas. Whiskey has a long history and is enjoyed across the globe, with each region producing distinct variations.