Ballistic Missile Defense (BMD) refers to a system designed to detect, track, and intercept incoming ballistic missiles. These missiles are typically launched in a high arc and can carry nuclear, chemical, or conventional warheads. BMD systems use various technologies, including radar and interceptor missiles, to neutralize threats before they reach their targets. Countries like the United States and Russia invest heavily in BMD to protect their populations and critical infrastructure. The effectiveness of BMD systems can vary based on factors such as the missile's speed, trajectory, and the technology used in the defense system.