Smiling is a facial expression characterized by the upward curving of the corners of the mouth. It often involves the movement of facial muscles, particularly around the eyes, which can create a warm and inviting appearance. Smiling is commonly associated with feelings of happiness, friendliness, and approachability. In addition to expressing emotions, smiling can have social and psychological benefits. It can help to build connections between people, reduce stress, and even improve mood. Research shows that smiling can trigger the release of endorphins, which are chemicals in the brain that promote feelings of well-being.