Baking powder is a leavening agent commonly used in baking to help dough rise. It typically contains sodium bicarbonate, an acid, and a drying agent. This ingredient is essential for making cakes, cookies, and breads rise properly. It is a popular choice among bakers of all skill levels due to its reliable rise and delicious flavor. Some popular brands of baking powder include Rumford, Clabber Girl, and Arm & Hammer.