This document provides an overview of public relations including definitions, history, principles, and activities. It defines PR as the art of communication and managing connections between an organization and its publics. The history of PR traces back to figures like Julius Caesar and the development of the field in the late 19th/early 20th centuries. It also reviews current PR campaigns that utilize events, social media, unconventional methods, and celebrity endorsements. The principles of PR emphasize facts over fiction and the public interest. Common PR activities include publicity, advertising, research, and public affairs.