Organizational communication flows through an organization's structure and impacts behavior, human relations, and performance. There are formal communication channels like vertical and horizontal communication as well as informal communication through the grapevine. Communication flows can be upward, downward, lateral, and multidirectional. The communication process involves a sender, transmission, and receiver, but there can be barriers at each stage that disrupt the process, including personal, physical, and semantic barriers. An organization's communication style is influenced by its leaders' personal styles like assertive, aggressive, or non-assertive.