This document discusses the key concepts of communication theory, including definitions of communication, the communication process, and the importance of effective communication. It describes communication as the exchange of information between individuals through various channels. The communication process involves a sender encoding a message, sending it through a channel, where the receiver decodes and interprets the message. Feedback is also an essential part of the process to ensure the message was understood. Effective communication is important for building relationships and is integral to personal and professional life.