Coral reefs are crucial for marine ecosystems due to their role in providing habitat, biodiversity, and ecosystem services. They support a wide variety of marine life, including fish, invertebrates, and plants, making them some of the most diverse ecosystems on Earth. Coral reefs also act as nurseries for many species of fish, providing protection for young marine life to grow and thrive. Additionally, coral reefs help protect coastlines from erosion by reducing the impact of waves and storms. Overall, coral reefs play a vital role in maintaining the health and balance of marine ecosystems.