Final answer:
Non-verbal communication involves the use of body language, facial expressions, gestures, mannerisms, and grooming. It adds meaning to verbal communication.
Step-by-step explanation:
The form of communication that involves the use of body language, facial expressions, gestures, mannerisms, and grooming is known as non-verbal communication. Non-verbal communication plays an important role in conveying messages and can often add meaning to verbal communication. For example, a smile and nod can show agreement or understanding, while crossed arms and a frown can indicate disapproval or disagreement.
Non-verbal communication is universal and can be interpreted differently by individuals from different cultures or age groups. However, there are some universal facial expressions and gestures that convey similar meanings across cultures, such as a smile indicating happiness or a thumbs-up indicating approval.