Okay, so imagine you have a toy phone with buttons that you can push to make sounds. When you push a button, it sends a message to the other person on the toy phone. But what happens if the other person wants to send a message back to you? That's where the return channel comes in!
The return channel is like a special button on the toy phone that lets the other person send a message back to you. When you press the button, the toy phone knows that the message is meant to come back to you instead of going to the other person. Just like that, you can have a conversation over the toy phone!
In real life, a return channel is like a way for someone to reply to a message or signal that was sent to them. For example, when you send a text message on your phone, the return channel is how you know if the other person has read your message and is typing a response back to you.
So, think of the return channel as a way for you to have a conversation or exchange messages with someone, and for both of you to be able to talk or reply to each other. Cool, huh?