The document discusses the key elements of communication including the sender, message, channels, receiver, and feedback. It defines communication as a process of exchanging information between a sender and receiver to achieve common understanding. The elements of an effective message are that it must be clear, simple, meaningful, timely, and appropriate for the audience. Barriers to communication include physical, perceptual, cultural and language barriers, and these can be overcome through proper organization of information, use of simple language, and creating a supportive environment for the receiver.