I'd like to make a small technical digression here, because as abstract and simple as the connections here are, they are fundamental for communication in general, and thus also for communication between living beings.
Technically speaking, communication is the transmission of data. No more and no less. Through the context of the recipient, the data becomes information.
Here is an example: If I say "That's a big one!"
What do you think? What do I think? A tree? A beetle? A cake?
The context is created on the one hand by own experiences and on the other hand by the situation and previous conversations.
It is important that the receiver can only understand what the sender means if the context is at least approximately the same as that of the sender. Otherwise, the receiver may believe that he has understood exactly the right thing, but the sender meant something completely different.
The dialogue
S: "That's a big one! You know what I mean?"
E: "Yeah."
says nothing about whether the receiver received the information the sender intended to transmit.