There are two explanations_

One explanation is that the human psyche is essentially the same all over the world. The psyche is the inward experience of the human body, which is essentially the same in all human beings, with the same organs, the same instincts, the same impulses, the same conflicts, the same fears. Out of this common ground has come what Jung has called the archetypes, which are the common ideas of myths.

They are elementary ideas, what could be called “ground” ideas. These ideas Jung spoke of as archetypes of the unconscious. “Archetype” is the better term because “elementary idea” suggests headwork. Archetype of the unconscious means it comes from below. The difference between the Jungian archetypes of the unconscious and Freud’s complexes is that the archetypes of the unconscious are manifestations of the organs of the body and their powers. Archetypes are biologically grounded, whereas the Freudian unconscious is a collection of repressed traumatic experiences from the individual’s lifetime.