What is an artificial coral?

Corals are porous marine animals that live at the bottom of the ocean. Coral attaches to a strong foundation and then grows to create a coral reef. Corals are naturally vibrant and colourful. An artificial coral reef is a human-made underwater structure, typically built for the purpose of promoting marine life. Artificial reefs also improve hydrodynamics and help control beach erosion. Making artificial coral also adds colour to an aquarium.