n Jungian psychology, the shadow or “shadow aspect” is a part of the unconscious mind consisting of repressed weaknesses, shortcomings, and instincts. It is one of the three most recognizable archetypes, the others being the anima and animus and the persona. “Everyone carries a shadow,” Jung wrote, “and the less it is embodied in the individual’s conscious life, the blacker and denser it is.” It may be (in part) one’s link to more primitive animal instincts, which are superseded during early childhood by the conscious mind.
According to Jung, the shadow, in being instinctive and irrational, is prone to project: turning a personal inferiority into a perceived moral deficiency in someone else. Jung writes that if these projections are unrecognized “The projection-making factor (the Shadow archetype) then has a free hand and can realize its object–if it has one–or bring about some other situation characteristic of its power.”  These projections insulate and cripple individuals by forming an ever thicker fog of illusion between the ego and the real world.
Jung also believed that “in spite of its function as a reservoir for human darkness—or perhaps because of this—the shadow is the seat of creativity.