ABM full form is anti-ballistic missile (ABM) is a surface-to-air missile designed to counter ballistic missiles (see missile defense). Ballistic missiles are used to deliver nuclear, chemical, biological, or conventional warheads in a ballistic flight trajectory. The term "anti-ballistic missile" is a generic term conveying a system designed to intercept and destroy any type of ballistic threat; however, it is commonly used for systems specifically designed to counter intercontinental ballistic missiles (ICBMs).
The Indian Ballistic Missile Defence (BMD) Programme is an attempt to develop and to use a multi-layered ballistic missile defence system to protect from ballistic missile attacks. The India’s decision to develop Ballistic Missile Defense (BMD) was introduced in the light of the ballistic missile threat mainly from Pakistan, especially can be attributed to the Kargil War in 1999.
It is a double-tiered system which comprises land and sea- based interceptor missiles; the Prithvi Air Defence (PAD) missile for high altitude interception and the Advanced Air Defence (AAD) Missile for lower altitude interception. This system is supposed to be able to intercept missiles launched from a distance of 5,000 kilometers. It is also equipped with a network of radars for early warning and tracking and the command and control posts.
The PAD was tested for its accuracy, range and impact in November 2006 and the AAD was tested in December 2007. Aftertesting the PAD, India became the fourth country to have successfully developed an anti-ballistic missile system after the US, Russia and Israel.