The document discusses different levels of communication: - Intrapersonal communication occurs within an individual through self-dialogue. Interpersonal communication occurs between individuals and allows for immediate feedback. Organizational communication happens within and between different levels of a company. - Extrapersonal communication is between humans and non-humans and requires understanding between sender and receiver. Mass communication reaches a large audience through mediums like books and journals and requires persuasiveness in encoding the message. - Organizational communication can be internal-operational within a company, external-operational with outside parties, or personal without business purpose. Mass communication uses a mediator to transmit information to many people.