A submarine cable is a type of undersea cable that carries telecommunications signals across oceans and seas. These cables are essential for global internet connectivity, enabling data transmission between continents. They are laid on the ocean floor and can stretch thousands of miles, connecting various countries and regions. Submarine cables consist of multiple layers, including a core of optical fibers that transmit data using light signals. The cables are designed to withstand harsh underwater conditions and are often protected by layers of insulation and armor. Major companies and organizations invest in these cables to enhance communication networks, making them vital for modern technology and commerce.