Bourbon is a type of whiskey, but not all whiskey is bourbon. The distinction lies in the specific production requirements and regulations associated with bourbon. Bourbon is produced through a specific distillation process. It must be distilled to no more than 160 proof (80% alcohol by volume) and entered into the barrel for aging at no more than 125 proof (62.5% alcohol by volume). Additionally, it must be aged in new, charred oak barrels, which contribute to its distinct flavor. In addition, bourbon has specific legal requirements that must be met to be labeled as bourbon. These requirements include being produced in the United States, having a grain mixture that is at least 51% corn, and meeting specific aging and proof standards. Other types of whiskey may not have these same legal requirements.