In Jungian psychology, the shadow is either an unconscious aspect of the personality that the conscious ego does not identify in itself; or the entirety of the unconscious, i.e., everything of which a person is not fully conscious. In short, the shadow is the unknown side.
Shadow Work is how you integrate the aspects of your unconscious psyche into your conscious experience and allow the positive aspects of the shadow to express themselves. When properly used and channeled, the shadow-self has traits that you can use to further your own personal development.
What is a “shadow"
It comprises of the aspects of our personality that we tend to deem shameful, unacceptable, ugly. It can be envy, jealousy, rage, lust, desire for power or the wounds incurred in childhood, all of those we keep hidden.
You can say it is one’s dark side of self. And no matter what anyone says, everyone has a dark side to their personality.
Jung believes that when the human Shadow is shunned, it tends to sabotage our lives. Repressing or suppressing one’s shadow can result in addictions, low self-esteem, mental illness, chronic illnesses, and various neuroses.
Transformation, which so many of us are looking for, does not come from a place of denial. It comes from a place of acceptance.