The part of the mind whose contents people resist bringing into awareness.

Sigmund Freud assumed that the human mind was divided into three divisions: the id, ego, and superego, which, in turn, had both conscious and unconscious portions. The id, motivated by two biological drives—sex and aggression—operates according to the pleasure principle, seeking satisfaction and avoiding pain. Guided by the reality principle, the ego's goal is to find safe and socially...