An Air Defense System is a network of technologies and strategies designed to detect, track, and neutralize aerial threats, such as enemy aircraft or missiles. These systems often include radar, interceptor missiles, and command and control centers that work together to protect a specific area or asset from aerial attacks. These systems can be deployed by military forces or used to safeguard critical infrastructure. They are essential for national security, as they help prevent potential damage from hostile actions. Examples of air defense systems include the Patriot missile system and the S-400, which are used by various countries around the world.