Non-verbal communication refers to communicating through actions, attributes, and uses of space, time and objects rather than words. There are five main functions of non-verbal communication: regulating conversation flow, contradicting/complementing verbal messages, substituting for words, reinforcing verbal messages, and accenting meanings. Some key types of non-verbal communication include kinesics (body language), haptics (touch), paralanguage (vocal cues), chronemics (use of time), proxemics (use of space), and appearance.