Gestures and other nonverbal behaviours can also send messages.  When a person (sender) says, “Hello,” smiles and extends a hand toward you (the receiver), that person is sending a message that he or she is glad to meet you.  Feedback is a return message sent by the receiver.  When you smile and say, “Pleased to meet you,” you are giving feedback.  Feedback helps the sender know whether the message was understood correctly.

The communication process has only been completed successfully when the original sender receives feedback from the original receiver which shows that the message has been interpreted and understood correctly, that is, as the original sender intended it to be understood.