ID
The id is the only component of personality that is present from birth. This aspect of personality is entirely unconscious and includes of the instinctive and primitive behaviors. According to Freud, the id is the source of all psychic energy, making it the primary component of personality.
Ego
The ego is the component of personality that is responsible for dealing with reality. According to Freud, the ego develops from the id and ensures that the impulses of the id can be expressed in a manner acceptable in the real world. The ego functions in both the conscious, preconscious, and unconscious mind.
SuperEgo
The last component of personality to develop is the superego. The superego is the aspect of personality that holds all of our internalized moral standards and ideals that we acquire from both parents and society--our sense of right and wrong. The superego provides guidelines for making judgments. According to Freud, the superego begins to emerge at around age five.
The Interaction of the Id, Ego and Superego
With so many competing forces, it is easy to see how conflict might arise between the id, ego and superego. Freud used the term ego strength to refer to the ego's ability to function despite these dueling forces. A person with good ego strength is able to effectively manage these pressures, while those with too much or too little ego strength can become too unyielding or too disrupting.