What does the term river stage mean? Water science questions and answers, from the USGS Water Science School
According to Sigmund Freud, the ego is part of personality that mediates the demands of the id, the superego and reality. The ego prevents us from acting on our basic urges (created by the id), but also works to achieve a balance with our moral and idealistic standards (created by the superego).
Jung's definition of the ego is more restrictive than Freud's. The ego is the center of consciousness, but not the core of personality. Thus, ego is not the whole personality, but must be completed by the SELF: the center of personality that is largely unconscious.