Holothuroidea, commonly known as sea cucumbers, are soft-bodied marine animals found on the ocean floor. They belong to the phylum Echinodermata, which also includes starfish and sea urchins. Sea cucumbers play a vital role in the ecosystem by recycling nutrients and breaking down organic matter, making them important for ocean health. These creatures have a unique elongated shape and can vary in color and size. Some species can even expel their internal organs as a defense mechanism, which can later regenerate. Sea cucumbers are also harvested for food in many cultures, particularly in Asian cuisine, where they are considered a delicacy.