THAAD, or Terminal High Altitude Area Defense, is a missile defense system designed to intercept and destroy short, medium, and intermediate-range ballistic missiles during their terminal phase of flight. Developed by Lockheed Martin, it uses advanced radar and interceptor missiles to protect designated areas from potential missile threats. The system is mobile and can be deployed quickly, making it suitable for various operational environments. THAAD has been deployed in several locations, including South Korea and Guam, to enhance regional security and deter missile threats from countries like North Korea.