The post-larval stage is the fourth and final stage of the life cycle of an insect. It is also known as the PUPA stage, which is a Latin word meaning 'DOLL' or 'DUMMY'. During this stage, the insect undergoes metamorphosis, transforming from a larva into an adult. During this process, the insect's body changes shape and its organs are rearranged. The PUPA stage is a resting period in which the insect does not feed and is usually immobile. After the PUPA stage, the insect emerges as an adult.