This document discusses the basics of business and professional communication. It defines key terms like sender, message, encoding, channel, receiver, decoding, and feedback. It also covers principles of communication like it being unavoidable, operating on two levels, being irreversible, and being a process. Additionally, it discusses formal and informal communication networks in an organization and different channels of communication like face-to-face, teleconferencing, phone, and written. Finally, it defines verbal communication as the spoken word and nonverbal communication as body language.