This document provides an overview of key concepts in public relations. It defines public relations as a management function that helps organizations adapt to their various publics through evaluating attitudes, identifying policies, and executing communication programs to earn understanding and acceptance. The document also outlines several models for public relations including the MAC triad of message, audience and channel; the two-way communication model; and the PR planning process. It emphasizes that public relations is about building relationships and achieving business/organizational goals through strategic communication.