This document discusses the nature, functions, elements, and models of communication. It defines communication as a human activity that involves the deliberate or accidental transfer of meaning. The document outlines several functions of communication, including informative, instructive, persuasive, motivational, aesthetic, regulatory/control, and social interaction. It also describes elements of the communication process, including the source, message, recipient, medium, feedback, and barriers like physical, physiological, and psychological noise. Finally, the document reviews several models of communication, including source-message-receiver, transactional, field of experience, linear source-message-channel-receiver, circular, and developmental models.