The S-400 is a sophisticated air defense missile system developed by Russia. It is designed to detect, track, and engage various aerial threats, including aircraft, drones, and ballistic missiles. The system can target multiple objects simultaneously and is known for its long-range capabilities, making it a crucial component of modern military defense strategies. The S-400 consists of several components, including radar systems, command centers, and missile launchers. It can be deployed quickly and is often integrated with other military systems to enhance overall defense. Countries like Turkey and China have purchased the S-400, highlighting its significance in global military technology.