Non-verbal communication, popularly referred to as body language, relies primarily on seeing rather than hearing. The sending of a message by an appropriate channel to a receiver appears to have completed the communication process or at least the sender's responsibility. After sending the message, the sender becomes a receiver and the receiver becomes a sender through the process of feedback . Feedback is the receiver's response to the attempt by the sender to send the message. Feedback is the key to determination by the sender of whether or not the message has been received in the intended form.
Feedback involves choice of channel by the receiver of the original message.
The channel for feedback may be quite different from the original channel chosen by the sender. Effect on the receiver completes the communication process. Effective communication is the original sender having the desired effect on the receiver. Communication at its best minimizes misunderstanding between sender and receiver. The sender can not transplant a message or idea.