Facial expressions are a vital aspect of nonverbal communication, conveying emotions and reactions without the use of words. They can express a wide range of feelings, from happiness and surprise to anger and sadness. Understanding these expressions can enhance interpersonal interactions and improve emotional intelligence. The study of facial expressions is often linked to psychology and neuroscience, as they play a crucial role in how we perceive and interpret the emotions of others. Researchers like Paul Ekman have explored the universality of certain expressions across cultures, highlighting their importance in human connection and empathy.