Before we know about this aircraft we must be thinking ,what is a stealth fighter?; as the word 'stealth' implies it is an aircraft which is designed with stealth technology which is nothing but a LO-technology (Low Observable technology) which is used by military forces to overcome the tactics and passive electronic counter measures which cover a range of techniques used with personnel, aircraft, ships, submarines, and missiles to make them less visible to radar, infrared and other detection methods.