Undersea communication refers to the transmission of data across oceans and seas using cables laid on the ocean floor. These cables, known as submarine communication cables, carry internet and telephone signals between continents, enabling global connectivity. They are made of fiber optics, which allow for high-speed data transfer over long distances. The technology behind undersea communication relies on light signals transmitted through the fiber optic cables. Repeaters are placed at intervals along the cables to boost the signal strength, ensuring clear communication. This system is crucial for international communication, supporting everything from personal emails to global business transactions.