The RSM-40 is a type of surface-to-air missile system developed in the Soviet Union. It is designed to target and destroy enemy aircraft, providing air defense capabilities. The missile is known for its effectiveness in various combat scenarios and has been used by several countries since its introduction. This missile system is part of a broader category of military technology that includes other systems like the SA-2 Guideline and S-300. The RSM-40 features advanced guidance systems, allowing it to accurately track and engage fast-moving aerial threats, enhancing the overall security of military installations and assets.