This document provides an overview of key concepts in the study of human communication. It defines communication as the process of making sense of the world and sharing meaning with others. Effective communication requires that messages be understood, achieve their intended effect, and be ethical. Studying communication can improve employability, relationships, and physical/emotional health. Communication is described as a complex, rule-governed process that emphasizes both content and relationships. The document outlines several models of communication and lists five principles for effective communication throughout life: be aware of communication, use verbal and nonverbal messages effectively, listen thoughtfully, and appropriately adapt messages to others.