Non-verbal communication involves sending and receiving messages through gestures, body language, facial expressions, use of space, time management, color, and paralanguage. It accounts for 55% of communication according to Mehrabian's model. There are several types of non-verbal communication including kinesics (body movements), proxemics (use of space), haptics (touch), chronemics (time), chromatics (color), and paralanguage (voice cues). Non-verbal communication is important as it provides feedback, helps manage conflicts, and can communicate messages that verbal language cannot.