Shadow refers to the archetype that represents unacceptable sexual, animalistic, or Aggressive impulses, usually the opposite of the way we see ourselves. Shadow is the term from Jung that r epresents the dark side of the self with unacceptable desires that a person tries to hide from others.

Likewise, Shadow is the archetype that contains the evil side of humanity.

Shadow is also called Shadow Archetype.
Other /More definition:
Shadow refers to a one person surveillance