ELI5 Answer: Radar works by sending out light waves, the waves bounce off of objects and the radar picks up this returned light. You can make your plane more stealthy by:
1. Shaping your plane so that the waves bounce away from the source.
2. Coat you plane in material that absorbs some of the waves
Non-ELI5 Answer: [This](https://basicsaboutaerodynamicsandavionics.wordpress.com/2016/03/04/stealth-techniques-and-benefits/) is a pretty through explanation on radar and infrared signature reduction.
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