This document defines key concepts in business communication including senders, messages, encoding, channels, receivers, decoding, and feedback. It also discusses the unavoidable and irreversible nature of communication. Communication is examined as a process that often presents ethical challenges. Formal communication networks include downward, upward, and horizontal communication, while informal networks are based on relationships. Verbal communication involves spoken words and their meanings and tones, serving to express ideas, while nonverbal communication includes body language and facial expressions.