What is the Javelin anti-tank missile system that India plans to buy from US?

US has said that India is planning to acquire Javelin anti-tank missile system. The premier shoulder-fired anti-armour system automatically guides itself to the target after launch, allowing the gunner to take cover and avoid counter-fire. Javelin, which can be fired from inside buildings or bunkers, climbs above its target for improved visibility and then strikes where the armour is weakest.