Butter is a dairy product made by churning milk or cream to separate the butterfat. It is rich in fats, vitamins A, D, E, and K, and is widely used in cooking, baking, and as a spread. Butter enhances flavor, has a creamy texture, and comes in various types like salted, unsalted, and clarified (ghee). It should be stored refrigerated and consumed in moderation due to its high saturated fat content.