OK. Yes. That makes sense except for the fact that... Aren't all data packets basically mail, then?

Please don't waste your time on my faffing about with this. I'll understand it eventually. 😅

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Sure.

But one is me sending a letter to your mailbox (with a service that relays the letter).

The other is me and you talking a private room, that we both have an access code to, but that ultimately somebody (admin) controls the access codes for.

Hmmm... Yes.

And ultimately, there's a lot of stuff happening in the background to make it work in either case.