Ecdysozoans are a group of animals characterized by their ability to shed their exoskeletons through a process called ecdysis. This group includes diverse organisms such as arthropods (like insects and crustaceans) and nematodes (roundworms). They are part of the larger clade Ecdysozoa, which is defined by this molting process. These animals have a segmented body structure and a tough outer covering that provides protection and support. Ecdysozoans are found in various habitats, from deep oceans to terrestrial environments, and play essential roles in ecosystems as predators, prey, and decomposers.