Anti-aircraft defense refers to military strategies and systems designed to protect ground targets from aerial attacks. This includes a variety of weapons and technologies, such as missiles, anti-aircraft guns, and radar systems, which work together to detect and neutralize enemy aircraft. These defense systems are crucial for safeguarding important locations, such as military bases and cities, from potential threats. They can be deployed in various forms, including stationary installations and mobile units, allowing for flexibility in response to different aerial threats.