Final answer:
Freud posited that the id operates on the pleasure principle seeking immediate gratification, while the ego operates on the reality principle, balancing demands in a realistic way.
Step-by-step explanation:
According to Freud, the id operants according to the pleasure principle, whereas the ego operates on the reality principle. The id is the part of the unconscious mind that contains our most primitive drives or urges, and it seeks immediate gratification of desires such as hunger, thirst, and sex. The ego, on the other hand, is the rational part of our personality that balances the demands of the id and the superego in the context of reality and operates on the reality principle.