This document provides an overview of communication. It defines communication as the process of passing information from one to another and as the interchange of thoughts, opinions, and information by speech, writing, or signs. Key characteristics of effective communication are outlined, including clarity, having a clear aim or goal, maintaining logical linkages, and style of expression. The purposes of communication are also discussed as informing and persuading. The linear and Shannon-Weaver models of the communication process are presented. Barriers to communication and types of communication within organizations are summarized.