A sea cucumber is a marine animal belonging to the class Holothuroidea. They have elongated, soft bodies and are found on the ocean floor, primarily in shallow waters. Sea cucumbers play a vital role in the ecosystem by recycling nutrients and breaking down organic matter. These creatures have a unique ability to 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 and are believed to have health benefits.