Final answer:
Folded arms, shaking a finger, and avoiding eye contact are examples of non-verbal expressions, key components in nonverbal communication involving gestures and body language, which convey messages without words and are part of kinesics.
Step-by-step explanation:
Folded arms, shaking your finger to emphasize a point, and avoiding direct eye contact are all examples of non-verbal expressions. These types of gestures and body language are forms of nonverbal communication which can convey a variety of messages without the use of words. For instance, eye contact is often seen as a sign of engagement and confidence, whereas the lack of it could be interpreted as the opposite. Using folded arms might suggest to others that a person is not open to interaction or is feeling defensive.
Body language also plays a significant role when we communicate, as it can enhance or undermine the spoken words. As part of kinesics, the study of body movements, gestures, and facial expressions, understanding these nonverbal cues is critical for effective interpersonal communication.