Coral reefs are underwater structures built by tiny sea animals. Hard corals, which have a stone-like skeleton, grow into reefs on the edges of tropical islands and continents. Their beautiful shapes and colors are a magnet for divers, but they also provide an excellent home for thousands of marine creatures, including fish we love to eat.

Read more at https://www.fisheries.noaa.gov/national/habitat-conservation/shallow-coral-reef-habitat