This document discusses the importance of verbal and non-verbal communication. It begins by providing a brief history of research on non-verbal communication and defines verbal communication as involving words and non-verbal communication as body language, facial expressions, and intonations. It then explains that non-verbal communication provides additional context and meaning beyond what is said verbally. The document proceeds to describe various elements of non-verbal communication, including facial expressions, gestures, paralinguistics, body language, proxemics, eye gaze, haptics, appearance, and artifacts. It emphasizes that understanding non-verbal communication can help people more effectively understand and communicate with each other.