system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do stealth planes work? What makes them stealthy?
gpt
When they talk about stealth, they mean via RADAR. 

A quick breakdown of RADAR: Pretend it works like a dolphin's or bat's echolocation: we shoot radio waves in a direction and then those waves bounce off stuff and if the waves bounce back toward us, we can "see" whatever the radio wave bounced off of.

Stealth planes use a combination of angular shapes and reflective materials to bounce RADAR off of the plane, but not back towards the "listening" location. Imaging a dolphin trying to look for fish with clicks, but every time a sound hits the fish, the sound bounces up or down instead back to the dolphin, making it so the dolphin doesn't detect that particular fish.