This document discusses nonverbal communication, which is communication through body language, gestures, eye contact, tone of voice, touch, use of space, time, color and other means besides words. It defines nonverbal communication and explains that nonverbal signals can reinforce or replace spoken communication. It also outlines several types of nonverbal communication like kinesics (body movements), paralanguage (vocal tones), proxemics (personal space), haptics (touch), oculesics (eye contact), chronemics (time) and others. The document emphasizes that nonverbal communication is mostly unconscious but plays a big role in how messages are interpreted.