system
Given the following post, respond as if you're commenting on Reddit:
human
How does a Faraday cage work?

I'm not incredibly science savvy so if you could explain this like you were explaining it to a 12 year old, that would be great :) Thanks.
gpt
Basically it works because electrons on a metal conductor can move with absolute freedom. Which means anytime any electric field comes near it the electrons will move in the direction of that field (actually opposite direction because they're negatively charged but we can ignore that). But by having a lot of electrons move to one side of the conductor that leaves one side with a lot of negative charge and the other side with excess positive charge.  This leads to the metal object creating a field exactly opposite the one that was originally applied. These two fields thus add together to create a net 0 electric field.  So no electric field can get inside a metal object.