Facial expression refers to the movements and positions of the muscles in the face that convey emotions and reactions. These expressions can indicate feelings such as happiness, sadness, anger, surprise, and fear. They play a crucial role in nonverbal communication, helping people understand each other's emotional states without the need for words. Different cultures may interpret facial expressions in various ways, but some basic expressions are universally recognized. For example, a smile typically signifies happiness, while a frown often indicates sadness. Understanding facial expressions can enhance interpersonal interactions and improve emotional intelligence.