Buttermilk powder is a dehydrated form of buttermilk, which is the liquid left after churning cream into butter. It retains the tangy flavor and nutritional benefits of fresh buttermilk, making it a convenient ingredient for cooking and baking. This powder is often used in recipes for pancakes, biscuits, and salad dressings, providing moisture and a slight acidity. It can be reconstituted by mixing with water or used directly in dry mixes, offering a longer shelf life than liquid buttermilk.