Non-verbal communication involves the transmission of messages through visual cues like body language, proxemics, paralanguage, haptics, and chronemics. It includes two processes: encoding information through facial expressions and gestures, and decoding received signals. The five major forms of non-verbal communication are proxemics (use of space), kinesics (body language), chronemics (use of time), paralanguage (vocal cues), and artifacts. Proxemics refers to Edward Hall's theory of four distances in relationships: intimate, personal, social, and public.