A mood is an emotional state. Moods differ from emotions, feelings or affects in that they are less specific, less intense, and less likely to be triggered by a particular stimulus or event. Moods are typically described as having either a positive or negative valence. In other words, people usually speak of being in a good mood or a bad mood.
Mood also differs from temperament or personality traits which are even longer lasting. Nevertheless, personality traits such as optimism and neuroticism predispose certain types of moods. Long term disturbances of mood such as clinical depression and bipolar disorder are considered mood disorders. Mood is an internal, subjective state but it often can be inferred from posture and other behaviors. "We can be sent into a mood by an unexpected event, from the happiness of seeing an old friend to the anger of discovering betrayal by a partner. We may also just fall into a mood."
Research also shows that a person's mood can influence how they process advertising. Mood has been found to interact with gender to affect consumer processing of information