The primary purpose of the small intestine is to facilitate the digestion and absorption of nutrients from food. After food passes through the stomach, it enters the small intestine, where enzymatic digestion occurs with the help of pancreatic enzymes and bile from the liver. The small intestine consists of three parts: the duodenum, jejunum, and ileum. Nutrients, including carbohydrates, proteins, fats, vitamins, and minerals, are absorbed through the intestinal walls into the bloodstream. This process is crucial for providing the body with the energy and essential components needed for growth, repair, and overall health.