This document provides an overview of public relations (PR) including its history and definitions from PR pioneers. It discusses how PR manages communication between organizations and their publics through planned and deliberate efforts. Some key aspects highlighted include PR's use of publicity and media relations to favorably communicate information about clients, while distinguishing it from advertising by aiming not to pay for media placement and sometimes disguising the sponsor. The document traces the roots of PR concepts back to ancient Greece and covers views of PR from Ivy Lee, Edward Bernays and other influential figures in establishing the PR field.