What is the Digestive System and what does it do?

Your body is a machine that is working non-stop all the time. To do its many tasks efficiently, it needs energy, which comes from the foods you eat – carbohydrates, proteins and fats. Your digestive system is designed in a particular way so that it can convert food that you eat and the air that you breathe into nutrients for the body to use as energy and tissue to keep your body (inside & outside) healthy and strong, as well as help it to grow and regenerate new cells and tissues (such as our skin) and to repair old tissues.
All this happens in the Alimentary Canal, which can be best described as a long twisting and winding tube beginning at the mouth and ending at the anus.