Which structure of personality in Freud's theory is known as the "pleasure principle"?

The structure of personality in Freud's theory known as the "pleasure principle" is the Id. The Id is the most primitive part of personality that operates based on instinctual drives and demands immediate gratification of needs and desires. It is entirely unconscious and is responsible for our basic impulses, such as hunger, thirst, and sexual urges.

The concept of the pleasure principle emphasizes that the Id seeks to avoid pain and seek pleasure without consideration for reality or social norms. This instinctual drive contrasts with the other structures of personality, such as the Ego, which operates on the reality principle and mediates between the Id's desires and the external world, and the Superego, which internalizes societal norms and morals. Understanding the Id and its focus on immediate gratification helps to clarify the foundations of Freud's overall theory of personality development.