The Great Barrier Reef is important because it is one of the most biodiverse ecosystems on Earth, providing habitat for thousands of marine species including fish, sharks, corals, and sea turtles. It contributes significantly to Australia's economy, sustaining more than 60,000 jobs and generating about $6.4 billion annually, primarily through tourism. Additionally, it offers crucial coastal protection, cultural value to Indigenous Australians, and opportunities for scientific and medical research. The Reef also plays a vital role in mitigating climate change impacts and maintaining ocean health. Its status as a UNESCO World Heritage Area highlights its global ecological, cultural, and economic significance. However, it faces threats from climate change, pollution, and human activity, making its conservation critical.