Smile is considered to be an act or expression of joy or happiness which is followed by brightening of face or glowing up of one’s countenance. It is used to express pleasure, mirth or happiness. Smile might be a fully bright one and cheerful. Smiling faces look more bright, cheerful and resplendent. People smile when they are extremely happy or find something quite amusing or funny. Smile may even be supplemented with laughter in any case.