the unconscious

The unconscious is the part of the mind containing thoughts, memories, and desires that lie outside conscious awareness but still influence behavior and experience.

Freud made the term central to psychoanalysis, proposing that repressed material in the unconscious shapes dreams, slips of the tongue, and neurotic symptoms.

Jung expanded the concept to include a collective unconscious shared across humanity.

In casual use, the unconscious often just means mental activity we're not aware of: Something in my unconscious must have been working on the problem, because I woke up with the answer.