A body, or corpse, is the physical remains of a living organism after death. In humans, it typically includes the head, torso, arms, and legs. Bodies undergo various changes after death, such as rigor mortis, which is the stiffening of muscles, and decomposition, where bacteria and other organisms break down tissues. Corpses can be studied in fields like forensic science to determine the cause of death or time of death. They are also important in medical education for teaching anatomy and surgical techniques. Respect for the deceased is crucial in many cultures, influencing how bodies are treated after death.