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

Take a tennis ball and throw it straight at a wall. It will bounce back at ya.

Take the same ball and throw it at a slanted wall. It will bounce some where else.

Take it and throw at the sand. It will be absorb.

F117 uses those slanted angles to deflect. Modern stealth is like the sand and will absorb and deflect somewhat.