The common bile duct is an important anatomical structure in the human body that carries bile from the liver and gallbladder to the small intestine. Bile is a digestive fluid that helps break down fats and aids in the absorption of fat-soluble vitamins. The common bile duct plays a crucial role in the digestion and absorption of dietary fats and helps regulate the process of digestion. It serves as a vital connection between the liver, gallbladder, and small intestine, ensuring the proper flow of bile for effective digestion and nutrient absorption.