This document provides an overview of health communication, including its definition, process, functions, types, barriers, and methods. It defines communication as the transfer of information between people to develop understanding. The communication process involves a sender encoding a message, the message being transmitted through a media or channel, and received by an audience who provides feedback. Key points covered include the roles of sender, message, media, and audience. It also discusses different types of communication, barriers to communication, qualities of good communicators, and methods used in health communication such as IEC, BCC, SBCC, and counseling.