Jung postulates that each individual has both masculine and feminine components of the psyche. For a male the feminine component is the anima, and for a female it is the animus. Part and parcel of human biological and psychological development is this mixture of masculine and feminine energies.
Jung explains that human beings are psychologically androgynous with latent inner masculine and feminine energies awaiting development. In the first half of life a differentiation of the primary sexual identity and corresponding energy takes place but in later life a call to integrate the opposite energy, the anima or the animus, arises. This is a move towards wholeness.