Eli5: What makes a stealth fighter harder to detect than a regular plane?

Question

Eli5: What makes a stealth fighter harder to detect than a regular plane?

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Answer 1

The shape of the plane redirects some of the radar energy waves away from the plane but not back towards the radar tracker. The material of the plane coating absorbs some of the radar energy waves so they don’t bounce back towards the radar tracker. If it works well the radar system doesn’t detect that a plane is there. If it does’t work so well the radar tracker registers that there’s an insect or something.