Asteroidea, commonly known as sea stars or starfish, are fascinating marine animals found in oceans worldwide. They belong to the phylum Echinodermata, which also includes sea urchins and sea cucumbers. Sea stars typically have a central disc and five or more radiating arms, giving them their star-like appearance. They play a crucial role in marine ecosystems as predators, primarily feeding on bivalves like clams and oysters. These creatures have remarkable regenerative abilities, allowing them to regrow lost arms, which helps them survive in their often harsh environments. Sea stars possess a unique water vascular system that aids in movement and feeding. Their vibrant colors and diverse shapes make them a popular subject for marine enthusiasts and researchers alike.