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

Radar uses radio waves, which is basically invisible light. So, how stealthy something is, is measure of how shiny or not it is. You can make the plane (for example) less shiny by painting it with black paint, by making it such a shape as it doesn’t reflect the ‘light’ back towards you, or by making it out of transparent material. Or some combination of all three.