Sea stars, commonly known as starfish, are marine animals belonging to the class Asteroidea. They typically have a central disc and five or more radiating arms, which can regenerate if lost. Sea stars are found in various ocean habitats, from tidal pools to deep-sea environments, and they play a crucial role in the ecosystem as predators of bivalves and other invertebrates. These creatures have a unique water vascular system that helps them move and feed. Sea stars use tube feet, located on their underside, to grasp surfaces and capture prey. They are known for their vibrant colors and can vary in size, with some species reaching over a foot in diameter.