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 Real Engineering video on the F-35B discusses the engineering principles behind the stealth capabilities of that plane. It a lot about how the shape of the plane is designed to not reflect much of the radar signal back to the sources. For example avoiding two flat surfaces 90deg apart which can cause a double bounce.