Final answer:
Non-verbal communication includes facial expressions, gestures, body language, and eye contact, and its correct interpretation can vary by culture.
Step-by-step explanation:
The concept described involves facial expressions, gestures, body language, eye contact, and mannerisms, which all relate to non-verbal communication. This type of communication is symbolic and often culturally specific. For instance, while a smile often indicates joy and is nearly universal, other gestures such as the thumbs-up can have different meanings across cultures; it implies positive reinforcement in the United States but is considered offensive in places like Russia and Australia. Non-verbal communication also includes paralanguage aspects such as tone and accent, as well as kinesics, which involve subconscious body movements. Understanding an individual's emotional state can often be deduced from their body language, although interpretations may vary across different cultural contexts.