The document summarizes the key components and functions of the digestive system in humans. It outlines the four main steps of digestion: ingestion, digestion, absorption, and elimination. It then lists and defines the major organs involved, including the mouth, esophagus, stomach, liver, pancreas, and small and large intestines. It also explains how the digestive system works with the immune and circulatory systems to break down food, absorb nutrients, and distribute them throughout the body.