Emotions are physiological reactions to a stimulus.
Psychologists distinguish between emotions, feelings and moods.
Emotion is a "physiological reaction to a stimulus". Primary emotions comprise Fear, Anger, Disgust, Displeasure, Surprise, Pleasure.
Feelings are the "mental experience of emotion", e.g. Amusement, Embarrassment, Guilt, Pride, Relief, Shame.
Mood is a "diffused and unfocused" emotional state about general expectations of positive or negative affect in the future, e.g. anguish, anxiety.