Facial expressions refer to the movements and positions of a person's face that convey emotions, attitudes or moods. These gestures can include raising eyebrows, furrowing brows, smiling, frowning, etc., which are often involuntary responses to internal feelings or external stimuli. Facial expressions play an important role in nonverbal communication and help convey emotions without the use of words. They also provide valuable clues about a person's inner state of mind and can be used to interpret their mood, intentions or reactions.