Non-verbal communication is defined as the process of conveying a message without the use of words. It includes various forms such as facial expressions, body language, gestures, eye contact, posture, and the use of space. Sounds like grunting and coughing are not considered non-verbal messages as they do not convey a specific message or intent without accompanying verbal communication. Non-verbal communication is often used in conjunction with verbal communication to provide a full message. References: = The information is based on the definitions and explanations of non-verbal communication found in the provided search results123.