Hydrophones are specialized underwater microphones designed to detect and record sound in aquatic environments. They convert sound waves into electrical signals, allowing researchers to study marine life, underwater geology, and environmental changes. Hydrophones are commonly used in oceanography, marine biology, and naval applications. These devices can be deployed in various settings, from shallow coastal waters to the deep ocean. They help scientists monitor whales, dolphins, and other marine animals, as well as track underwater noise pollution. Hydrophones play a crucial role in understanding the health of marine ecosystems and the impact of human activities on ocean life.