This document discusses principles of business communication. It explains that communication plays a vital role in business by allowing the exchange of messages and information. Communication involves more than just language - it can also include gestures, appearance, paralanguage, physiology, and other nonverbal signals. The document also discusses different mediums of communication used in business, including formal methods like letters and emails as well as informal methods for advertising. It outlines several purposes of business communication such as exchanging information, counseling, persuading, motivating employees, and developing relationships. The document provides guidance on writing proposals and reports for business as well as resume writing and presentation skills.