Stealth aircraft are specially designed military planes that minimize their visibility to radar and other detection methods. They achieve this through unique shapes, materials, and technologies that absorb or deflect radar waves, making them harder to spot. This capability allows them to conduct missions with a lower risk of being detected by enemy forces. Examples of stealth aircraft include the F-22 Raptor and the B-2 Spirit. These planes are used for various purposes, such as reconnaissance and air-to-air combat, and play a crucial role in modern warfare by allowing for surprise attacks and strategic advantages.