This document defines communication and discusses the key components and types of communication. It introduces communication as the sharing of ideas and feelings between people. It then defines communication from several sources and discusses classroom communication. The document outlines the main components of communication as the sender, message, medium, receiver, and feedback. It also lists the types as speaking-listening, visualizing-observing, writing-reading, and doing-learning. Finally, it discusses the factors that can affect communication, such as those related to the sender, receiver, atmosphere, message, and climate as well as the barriers that can interfere with effective communication.