This document discusses non-verbal communication or body language. It begins by defining non-verbal behavior as communication without words using facial expressions, gestures, posture, eye contact, and touch. It then lists some common functions of non-verbal communication like expressing emotions and attitudes. While some signals like the six basic emotions are universal, non-verbal behavior varies across cultures. The document then categorizes and provides examples of different types of non-verbal communication and highlights some cultural differences in their meanings.