This document provides an overview of key concepts in business communication. It defines business communication and explains that it encompasses both internal communication within an organization as well as external communication with outside parties regarding business affairs. The document outlines various topics that business communication includes, such as marketing, branding, and public relations. It discusses the importance of effective business communication for organizational efficiency, leadership, employee morale, and more. Additionally, it describes different methods of business communication and defines some essential business communication terminology and abbreviations.