Baking powder is a common ingredient that is often used to lighten and fluff up the texture of certain baked goods. It is a common ingredient in many cakes, cookies and other sweets and can even be used to make bread lighter. Not using baking powder may result in denser finished products that don't achieve the desired texture you are after. Because of its sheer versatility and what it can do for your baked goods, it is a good staple to have in your pantry.