Communication involves the mutual exchange of understanding between speakers and receivers. Feedback from the audience allows the speaker to evaluate the effectiveness of the message. The communication process involves the speaker generating an idea, choosing an appropriate channel to convey the message to the receiver, who then interprets and responds with feedback to complete the process. Feedback is important as it makes communication meaningful, sustains the process by ensuring the message is understood correctly, and helps plan future communication. Proper feedback also helps avoid misunderstandings and determine if a message had the desired effect.