A warship is a vessel built specifically for naval combat. Unlike cargo ships that carry goods or passenger ships that transport people, warships are designed to fight at sea. They carry weapons like cannons, missiles, and torpedoes, and their crews train constantly for battle.

Throughout history, warships have determined the outcomes of wars and shaped world events. Ancient Greek triremes rammed enemy vessels with bronze-tipped bows. Spanish galleons carried treasure across oceans while fighting off pirates. During World War II, massive battleships and aircraft carriers clashed in the Pacific Ocean, changing the course of history.

Modern warships include destroyers, cruisers, submarines, and aircraft carriers (floating airports that can launch jets from the middle of the ocean). Some warships specialize in specific missions: submarines hunt beneath the waves, minesweepers clear dangerous explosives from shipping lanes, and patrol boats guard coastlines.

When you see a warship in a museum or historical photograph, you're looking at a machine built for one of humanity's most serious purposes: defending people and a nation's interests at sea.