Essentially two things make it stealth.
Radar works by transmitting a radar signal, then listening for the signal to come back after it bounces off of an object. The shape is of the fuselage is designed to prevent the radar signal from going back to the radar antenna.
The second part is the skin of the plane is made of materials designed to absorb radar signals.
These two things to combine to make it harder to detect a stealthy aircraft with a radar.
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