A blockade is a strategy used to prevent goods, services, or people from entering or leaving a specific area. This can be done by military forces, ships, or even by economic means. Blockades are often employed during conflicts to weaken an opponent by cutting off their supplies and resources. Historically, blockades have been used in various wars, such as the American Civil War and World War I. They can also occur in political situations, where countries impose trade restrictions on others to exert pressure. Blockades can significantly impact the economy and daily life of the affected population.