A blockade is a military strategy used to prevent goods, services, or people from entering or leaving a specific area. This can involve surrounding a location, such as a city or port, to cut off supplies and support. Blockades are often used during wars to weaken an enemy's resources and morale. Blockades can also occur in non-military contexts, such as during political protests or economic sanctions. For example, a government might impose a blockade to restrict trade with another country, impacting its economy. Historical examples include the Berlin Blockade and the Cuban Blockade.