The Navy is the branch of a country's armed forces that specializes in naval and amphibious warfare, including operations on, under, and over the sea. Its primary mission is to protect its nation's maritime interests, maintain sea lanes, and project power abroad. This is accomplished through a fleet of surface ships, submarines, and naval aircraft, and often includes diplomatic, humanitarian, and security-related roles, such as combating piracy and providing disaster relief. It protects a nation's borders and allies at sea, which includes defending against threats and ensuring freedom of navigation. The Navy responds to natural disasters and other crises by providing humanitarian aid, medical support, and rescue operations.
The Navy can deploy naval forces globally to deter aggression and support national interests in strategic regions while conducting offensive and defensive operations at sea using warships, submarines, and seaborne aviation and providing logistics, transportation, and other support for other branches of the military, such as the Marine Corps. The Navy Maintains maritime law and order, combats piracy, and ensures the security of sea-based trade routes, and can also attack land targets from the sea.