The document discusses several definitions of communication and models of the communication process. It defines communication as the transmission of information, ideas, emotions, and skills through symbols. Communication is essential for human relationships, learning identity, and satisfying social and instrumental goals. Several influential models are described, including Aristotle's speaker-audience model, Laswell's "who says what" model incorporating multiple factors, Shannon and Weaver's model adding transmitters and receivers, and Schramm's model introducing feedback and fields of experience. Berlo's model identifies controlling factors for sources, messages, channels, and receivers. Dance's helical model shows communication is an ongoing process that changes communicators.