Cold-water corals are marine organisms that thrive in deep, cold ocean waters, typically at depths of 200 meters or more. Unlike their tropical counterparts, they do not rely on sunlight for energy, as they do not have symbiotic algae. Instead, they feed on plankton and organic particles drifting in the water. These corals form complex structures known as reefs, which provide habitats for various marine species. Cold-water coral reefs are found in regions like the North Atlantic and Norwegian Sea, playing a crucial role in marine biodiversity and ecosystem health.