This slightly smiling emoji expresses a pleasant contentment and inner peace. It is used to make a statement seem friendlier, even if it is not necessarily meant that way. In some cases, a slight smile can even have a sarcastic undertone, especially when a smile seems inappropriate for the situation. In such situations, it can be used in a humorous way to suggest a wink or an ironic remark. It is ideal for adding a soft, positive touch to text messages or to make the recipient smile.