A well-known example of an ecosystem is a coral reef. Coral reefs support a wide variety of marine life, from fish to mollusks and algae, each of which plays a role in the overall health of the reef. Practically, coral reefs provide numerous benefits to humans, including acting as barriers to coastal erosion, supporting local fisheries, and boosting tourism. They also play a key role in maintaining the balance of marine ecosystems by providing food and habitat to diverse species.