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Sea stars, also known as starfish, are a type of marine animal belonging to the class Asteroidea and phylum Echinodermata. They are characterized by their radial symmetry, five-pointed arms, and hard, spiny skin. Sea stars can be found in various habitats throughout the world's oceans, including coral reefs, tidal pools, and deep-sea environments. As members of the phylum Echinodermata, sea stars share certain features with other echinoderms such as sea urchins, sand dollars, and sea cucumbers. These include a water vascular system that allows them to move and breathe, and an endoskeleton made up of calcium carbonate plates. Sea stars play important ecological roles in their environments. They are predators that help regulate populations of mollusks and other marine animals, and they also serve as prey for larger animals such as sharks and sea otters. Additionally, some species of sea stars have the ability to regenerate lost arms or even entire bodies, making them fascinating subjects for scientific study. In summary, Sea Stars are a type of marine animal that belongs to the class Asteroidea and phylum Echinodermata, they are known for their radial symmetry, five-pointed arms, hard, spiny skin, water vascular system and endoskeleton made up of calcium carbonate plates. They play important ecological roles in their environments as predators and prey.