Any time you use a device to communicate information—an email, a text message, any data transfer—the information in that transmission crosses the open internet, where it could be intercepted. Such communications are also reliant on internet connectivity, often including wireless signal on either or both ends of a transmission.
But what if two—or 10, or 100, or 1,000—entities could be connected in such a way that they could communicate information without any of those security or connectivity concerns?
I’ll take your word for it, I’m out of my depth.
It’s called quantum teleportation. There are some pretty good, somewhat informal guides to the subject if you get curious.