The document discusses communication, defining it as the transfer of information from a sender to a receiver. It notes communication involves sending a message, as well as the receiver listening, interpreting, and responding. The document outlines the key components of communication as the sender, message, channel, and receiver, with feedback. It also discusses the importance of communication, types of communication based on organization structure, direction and expression. Finally, it covers guidelines for effective communication and potential barriers to communication, including semantic, psychological, organizational and personal barriers.