a high level description of facial motions, which can be decomposed into certain muscular activities, i
a motion or position of the muscles of the face
A teacher can show how they feel through their face, e.g. smiling, showing surprise.
A facial expression results from one or more motions or positions of the muscles of the face. These movements convey the emotional state of the individual to observers. Facial expressions are a form of nonverbal communication.