Your body needs food. Food gives your body energy. Food helps your body grow. But the food has to be changed into a form your body can use. That is the work of the digestive system.
Different organs do different parts of the job. The main parts of the digestive system are the mouth, the esophagus, the stomach, the liver, the gall bladder, the pancreas, the small intestine, and the large intestine.
When you put food in your mouth, your teeth begin the job of digestion. Your teeth bite food into smaller pieces. Your teeth grind the food into smaller bits. Your saliva, or spit, mixes with the food, too. This also helps to digest your food.