A/an is a rather intense but short-lived feeling about a person or a situation,

A/an emotion is a rather intense but short-lived feeling about a person or a situation, whereas a/an mood is a more generalized positive or negative state of mind

Explanation:

Emotions can be defined as an intense feeling which is directed at something or someone.whereas Mood is a feeling that more generalized and less intense than a emotion.Basically emotions can be defined into two types

The Mood of an individual either be Positive or Negative.Where as emotions of an individual can be categorized into:

These six basic emotions can also be noted as either positive or negative.