A hydrophone is a type of underwater microphone designed to detect and record sound waves in water. It converts acoustic energy into electrical signals, allowing researchers and engineers to study underwater environments. Hydrophones are commonly used in marine biology, oceanography, and underwater communication. These devices can capture a wide range of sounds, from the calls of marine animals like whales to the noise generated by human activities such as shipping and fishing. Hydrophones play a crucial role in monitoring ocean health and understanding the impact of noise pollution on aquatic life.