Metal is shiny, not just to visible light, but also to the microwave lights that radars use. A radar is kind of like a big flashlight that looks around for anything that shows up in the light. The radar’s computer determines how big something probably is based on how much it lights up when the microwave flashlight is pointed at it (and some other stuff).
So the trick to stealth is to make the plane not show up in the different types of microwave light very much, so the radar computers think that they see a cloud or a bird, instead of a plane. So like others have said, the type of paint and the angles of the plane and even the flight path are all designed to make the plane look like something the radar operator wouldn’t be interested in, until it’s close enough to have launched it’s missiles and turned around (or whatever).
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