A military alliance is a formal agreement between two or more countries to cooperate for mutual defense and support during conflicts. These alliances are often established to enhance security, deter aggression, and share resources. Countries in a military alliance may conduct joint training exercises, share intelligence, and coordinate military strategies. One of the most well-known military alliances is NATO (North Atlantic Treaty Organization), formed in 1949. It includes countries from North America and Europe, committed to collective defense, meaning that an attack on one member is considered an attack on all. Such alliances play a crucial role in international relations and global security.