Buttermilk is a tangy, creamy liquid that is often used in cooking and baking. Traditionally, it was the leftover liquid from churning cream into butter. Today, most buttermilk found in stores is cultured, meaning that beneficial bacteria are added to milk to create its unique flavor and texture. This makes it a popular ingredient in recipes like pancakes, biscuits, and salad dressings. In addition to its culinary uses, buttermilk is also known for its health benefits. It is lower in fat than regular milk and contains probiotics, which can aid digestion. Many people enjoy drinking buttermilk on its own or using it as a base for smoothies.