Emotional expression is the observable manifestation of an individual's internal emotional state, encompassing a range of behavioral, physiological, and verbal cues. As a central concept in psychology, sociology, and communication studies, it investigates how subjective feelings are externalized and communicated, highlighting the multimodal nature of this process (e.g., facial expressions, vocalizations, posture, physiological changes, linguistic content). Its significance lies in its fundamental role in social interaction, the communication of needs and intentions, and the study of psychological well-being and disorders.