This document discusses non-verbal communication and provides an overview of the topic. It defines non-verbal communication as messages not expressed in words, and notes that actions often communicate more than words. The document then outlines the main types of non-verbal messages, including body language, artifacts, voice, space/distance, color, time, and touch. For each type, some key aspects are defined. The document concludes with tips for improving non-verbal communication skills like maintaining positive body language and observing others' non-verbal cues.