This document discusses different types of non-verbal communication including physical cues like body language, gestures, facial expressions, and tone of voice. It categorizes non-verbal communication into physical, aesthetic, signs, and symbolic. Some key features of non-verbal communication are static cues like distance and orientation, and dynamic cues such as gestures and facial expressions. Paralanguage, chronemics, and humor are also discussed as important non-verbal dimensions. The document emphasizes that non-verbal communication is important as it can repeat, accent, complement, regulate, or substitute for verbal messages in interactions.