The regenerative abilities of a particular species of flatworm, the planarian, have been a topic of discussion and interest among scientists. These animals can regenerate parts of their body that have been cut off. This review includes the general introduction of planarians, the types of stem cells in its body, its basic anatomy and physiology, behavior, regeneration process, and applications to the medical field. We also predict the future of regenerative medicine that could be achieved by studying this particular animal model.