This document provides an overview of communication within business organizations. It discusses that communication is the most important activity that humans engage in and is essential to organizing activity. Without communication, an organization cannot function as there would be no coordination, planning, decision making, or direction. The document outlines the main forms of organizational communication, including internal operational communication, external operational communication, and personal communication. It also describes the organization's complex communication network and how information flows through it similar to the structure of the human body.