To keep it simple and avoid all of the techno-lingo, end-to-end encryption means that whatever you are sending is encrypted on your end, and it isn’t decrypted until it gets to the person you’re sending it to.
What this means is that if someone manages to copy/steal your message, they won’t be able to read it. It doesn’t matter if they work for Facebook, they won’t have access to your message.
They’ll know you sent one, when you sent it, who you sent it to, and the approximate size of the message, but that’s it.
There’s a *lot* more to it than that, but that’s the ELI5 version.
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