A naval blockade is a military strategy used to prevent ships from entering or leaving a specific area, usually to restrict the movement of goods and supplies. This tactic is often employed during conflicts to weaken an enemy's economy or military capabilities by cutting off essential resources. Naval blockades can be enforced by warships that patrol designated waters, stopping and inspecting vessels. They are considered a form of economic warfare and can lead to significant humanitarian impacts, affecting civilians who rely on imported goods for their daily needs. Examples of naval blockades include those used in the American Civil War and World War I.