The document discusses four levels of communication: intrapersonal, interpersonal, mass communication, and computer-mediated communication. It defines each level based on factors such as number of people involved, location, immediacy, context, and sensory channels. Intrapersonal involves internal communication within an individual. Interpersonal involves direct or mediated communication between two or small groups. Mass communication transmits messages to large, anonymous audiences using technologies like print, broadcast, and publishing. Computer-mediated communication uses internet and computer technologies for communication.