Non-verbal communication includes all unspoken messages conveyed through facial expressions, body language, gestures, eye contact, touch, voice, and use of space. It accounts for 55% of communication. Facial expressions universally convey emotions, while body language and posture communicate through stance and movements. Gestures vary across cultures so care needs to be taken. Eye contact maintains conversation flow and gauges responses, and touch conveys intimacy or aggression. Voice tone indicates moods and confidence. Physical space is used to signal relationships or assert dominance. Non-verbal communication enhances understanding of feelings behind spoken messages.