Octocorallia is a class of marine invertebrates that includes soft corals, sea fans, and sea pens. They are characterized by their eight tentacles and a skeleton made of a flexible material called gorgonin. Unlike hard corals, Octocorallia do not build large calcium carbonate structures, but they play a vital role in marine ecosystems by providing habitat and shelter for various marine species. These organisms are typically found in diverse ocean environments, from shallow reefs to deep-sea habitats. Octocorallia are important for biodiversity and can contribute to the overall health of coral reef ecosystems. They often exhibit vibrant colors and unique shapes, making them fascinating subjects for marine research and conservation efforts.