The feedback phase is the moment of communication when the recipient shows that they have received the message and understood all the information. This is because because the recipient gives feedback to the received message, that is, the recipient replies to the received message. It is only possible to reply to a message when that message is understood.
Paraphrasing - Listening to what the sender is communicating, analyzing the words, and restating them to confirm that the receiver has understood the message as the sender intended