Why do we need facial expressions and gestures?

Facial expressions and gestures are the main reflection of a person’s emotional state. Often without words, at a glance, you can determine which person is in the mood by the expression on his face. A smile on the lips, a welcoming gleam in the eyes, soft, flowing gestures speak of a benevolent mood. Whereas sharp, quick gestures, an expression of aggression or sarcasm on the face speak of anger, negative mood. The drooping corners of the mouth, tears in the eyes express resentment, melancholy, a painful state of people.