A Mutual Defense Pact is an agreement between two or more countries to support each other in case of an attack. This means that if one country is threatened or attacked, the others in the pact will come to its defense, often through military support. Such agreements are designed to deter potential aggressors by showing that an attack on one nation will lead to a collective response. These pacts can take various forms, including formal treaties or informal understandings. Notable examples include the North Atlantic Treaty Organization (NATO) and the Warsaw Pact. These alliances aim to enhance security and stability among member nations.