The id comprises the unorganised part of the personality structure that contains the basic drives. The id acts according to the "pleasure principle", seeking to avoid pain or displeasure aroused by increases in instinctual tension.[2]
The id is unconscious by definition:
"It is the dark, inaccessible part of our personality, what little we know of it we have learned from our study of the dream-work and of the construction of neurotic symptoms, and most of that is of a negative character and can be described only as a contrast to the ego. We approach the id with analogies: we call it a chaos, a cauldron full of seething excitations... It is filled with energy reaching it from the instincts, but it has no organisation, produces no collective will, but only a striving to bring about the satisfaction of the instinctual needs subject to the observance of the pleasure principle."[3]
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