Passive Acoustic Monitoring (PAM) is an innovative, non-intrusive method that relies on underwater microphones, known as hydrophones, to capture and interpret the natural sounds of marine ecosystems. Unlike active sonar systems, PAM does not transmit signals; it simply listens, allowing researchers to monitor continuously without disturbing aquatic life. Coral reefs, which are vibrant acoustic environments, reveal their health through patterns of biological sounds such as fish calls and snapping shrimp activity. By analyzing these soundscapes, PAM offers valuable insights into species diversity, behavioral trends, and stress factors linked to climate change or human impact. Globally, this technology has been adopted in areas like the Mesoamerican Reef and the Maldives to track reef recovery and support conservation planning. It complements traditional visual surveys, strengthens long-term ecological research, and informs marine protected area management. While PAM has been part of marine science since the 1980s, its role in reef restoration became prominent around 2010, with recent initiatives—such as the Rasfari Reef project in the Maldives—showcasing its potential for scalable and effective restoration strategies.