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Annelids, also known as segmented worms, are a group of invertebrate animals characterized by their elongated, cylindrical bodies divided into rings or segments. These animals can be found in a variety of habitats, including marine, freshwater, and terrestrial environments. They play important roles in ecosystems as decomposers, scavengers, and predators. Annelids are known for their ability to regenerate lost body parts and some species exhibit bioluminescence. Examples of annelids include earthworms, leeches, and polychaetes. As a subcategory of invertebrates, annelids contribute to the diversity of animals without backbones.