Non-verbal communication involves transmitting messages through non-verbal cues like eye contact, gestures, and body language rather than words. It plays an important role in understanding messages accurately, expressing emotions, and establishing relationships. There are various types of non-verbal communication such as facial expressions, body language, gestures, eye contact, tone of voice, proxemics, touch, and appearance. While non-verbal communication has advantages like communicating without words and from a distance, it also has disadvantages such as not being able to have long conversations or discuss details. It is important in professional settings to ensure non-verbal communication reinforces spoken messages.