A naval force is a branch of a country's military that operates at sea. It includes various types of ships, submarines, and aircraft designed for maritime warfare and defense. The primary roles of a naval force are to protect national interests, ensure maritime security, and project power across oceans. Naval forces can also engage in humanitarian missions, such as disaster relief and search-and-rescue operations. They often work alongside other military branches and international allies to maintain peace and stability in global waters, contributing to operations led by organizations like NATO or the United Nations.