For intelligent design, which is sometimes abbreviated as ID, see intelligent design.
Id is one of the three primary psychological constructs which comprise the human mind in Freudian psychoanalytical theory. It was derived by Sigmund Freud. The term id, Latin for "it", was used by Freud's first English translator in place of the German das Es ("the It"). The id is supposed to be, essentially, the component of the mind consituted of the primal desires present. In Freudian theory, the mind of a newborn child is considered to be entirely "id-driven", that is, the super-ego has not yet imposed its restraints, via the ego, upon the child's mind.
The instincts forming the id were classified by Freud into two categories: the life instincts — those necessary for a pleasurable survival — and the death instincts, the generally subconcious wish desire to die as a means of putting to an end the struggle to survive and be happy. The latter are considered to remain suppressed under the majority of circumstances, although breaks do, unfortunately, occur.
Although much of Freud's theory is considered to be outmoded by modern psychologists and doctors, the entities which he suggested have become somewhat engrained in modern society, and are frequently invoked by laymen to be able to gain a better, though superficial, understanding of the psychoanalytical conceptualization of the human mind.