Air defense refers to the measures and systems used to protect a country or area from aerial threats, such as enemy aircraft or missiles. This involves a combination of radar systems, interceptor aircraft, and surface-to-air missiles that work together to detect, track, and neutralize potential threats before they can cause harm. Effective air defense is crucial for national security, as it helps safeguard military bases, critical infrastructure, and civilian populations. Various countries invest in advanced technologies and strategies to enhance their air defense capabilities, often collaborating with allies to improve their systems and share intelligence on potential threats.