The primary function of the stomach is to digest food. It does this through a combination of mechanical and chemical processes. The stomach secretes gastric juices, which contain hydrochloric acid and digestive enzymes, to break down food into a semi-liquid substance called chyme. The mechanical churning action of the stomach muscles further aids in mixing the food with these gastric juices, enhancing digestion. Additionally, the stomach acts as a temporary storage site for food, regulating the release of chyme into the small intestine for further digestion and nutrient absorption.