The B-2 bomber, nicknamed Spirit and commonly known as the Northrop Grumman B-2 stealth strategic bomber, is a low detectability flying wing bomber developed by Northrop Grumman and Boeing in collaboration with MIT for the United States Air Force to carry out strategic nuclear/conventional strike missions.

The B-2 bomber is the only stealth strategic bomber in the world today, characterized by low detectability, commonly known as stealth capability. It can safely penetrate tight air defense systems for attacks. The stealth of B-2 is not limited to radar detection, but also includes reducing different signals such as infrared, visible light, and noise, minimizing the possibility of detection and locking. The B-2 can achieve a combat range of 12000 kilometers without refueling in the air, and up to 18000 kilometers with one refueling in the air. The air flight time for each mission is generally not less than 10 hours, and the US Air Force claims it has the capability of "global reach" and "global destruction".