What are the id, ego and superego?

The short answer

In his 1923 book The Ego and the Id, Freud described the mind as three interacting parts. The id is the reservoir of raw drives and wants, run on the pleasure principle: I want it, and I want it now. The superego is the internalized conscience and set of ideals, largely absorbed from parents and society: you should be ashamed of wanting it. The ego is the part that deals with reality and tries to keep the other two from burning the house down: maybe after lunch, and only a little.

The ego's impossible job

Freud described the ego as serving three harsh masters: the id, the superego and the outside world. It operates on the reality principle, delaying or redirecting the id's demands into something survivable, while trying not to get lectured by the superego. If that sounds like a middle manager, you have understood Freud.

A secret about the names

Freud wrote in plain German: das Es (“the It”), das Ich (“the I”) and das Über-Ich (“the Over-I”). His English translators rendered them in Latin, as id, ego and superego, which made them sound far more clinical than the originals. Nothing makes an idea feel scientific like a dead language.

How it holds up

Modern psychology doesn't treat the id, ego and superego as literal parts of the brain, and the model isn't tested the way today's theories are. But the broad idea, that behavior comes from competing impulses, rules and reality checks, much of it outside awareness, still shapes psychodynamic therapy and everyday language. You probably said “ego” this week without meaning Freud at all.