This document provides an overview of communication processes and models. It begins by defining communication and listing its key functions, which include control, motivation, emotional expression, and sharing of information. The communication process is described as having two phases - the transmission phase where a message is encoded and sent, and the feedback phase where the message is decoded and a response is generated. Different types of communication are also outlined, including downward, upward, lateral, interpersonal, and organizational communication. Models of communication presented include the Lasswell model, Shannon-Weaver model, and Schramm model. Barriers to effective communication like filtering, selective perception, and emotions are then discussed. The document concludes with the seven C's of effective communication.