Nonverbal communication is basically the act of speaking without using any words. A person can really understand what another person is thinking or feeling by using nonverbal communication. Impressions are mostly determined by nonverbal communication, for example a first impression is very important. During the interview process impressions are made. For example, a bad impression could be made by job candidate if they are looking down and have bad body posture.
Nonverbal communication can also take place through the physical arrangement of space.
Proxemics is the study of the way space is utilized. There are many communication barriers that come up during the communication process. First, there are physical distractions that interfere with the effectiveness of a communication attempt. For example, I work at a hardware store and I would be mixing paint for customer while another customer comes up to me and asks where something is located in the store. Mixed messages are another communication barrier.