The digestive system consists of the Alimentary Canal and various other organs whose primary function is to support the digestive system.
The Alimentary Canal is a long tube about 10 meters long, which begins at the mouth and ends at the anus. This tube consists of multiple sections which each have their own specific functions [...]

Eating (and drinking) are the taking in (swallowing) of food and other nourishing material by the body. That is, eating is the range of processes by which an organism takes in food.
Digestion is the process by which the materials we eat, such as food and drink, is broken down – into nutrients that [...]

The human digestive system is the parts of the body that are involved in turning food and drink into smaller molecules that can be absorbed into the bloodstream and carried by cells to other body systems. Digestion itself is a process by which the molecules of food and drink are made ready to be utilized [...]