how s400 air deffence works - why s400 is best air deffence system

Must watch why S 400 is world best Air defense system and why countries try to by it. its qualities, specification, range etc short glimpse and introduction in action.
The S-400 has been described, as of 2017, as "one of the best air-defense systems currently made. The system can engage all type of aircrafts, ballistic missiles, drones etc, the system was developed in the 1990s by Russia as an upgrade of the s300 family.
96L6E radar and equipment work separately (100 meters), 96L6E2 export version has the capability to track a maximum 100 targets. The system also detects aircrafts etc with stealth technology. The system can also hit high altitude targets including B52 bombers.
The S-400 uses four missiles to fill its performance envelope: the very-long-range 40N6 (400 km-570km), the long-range 48N6 (250 km), the medium-range 9M96E2 (120 km) and the short-range 9M96E (40 km).

Current operators are Russia, Belarus and China.
Future operators who have signed deal with Russia for purchase are Turkey, India, Algeria, Saudi Arabia.
Many countries in the world are also trying to get S400 air defense system as it is considered as most dangerous and effective defense system then thought.