'Noise' is the disruption interference in communication process anywhere along the way. It is also called barrier to effective communications. It can occur at any point in the communication process. Noise can be the sound of someone coughing, a truck driven by, or two people talking close at hand. It can also include disruptions such as a letter being lost in the mail, a telephone line going dead or one of the participants in a conversation being called away before the communication process is completed. This hindrance may be caused to sender, message or receiver.