System 1 vs System 2

You have two thinking modes. One's fast and runs the show. The other's slow and shows up late.

Definition

A dual-process model of cognition where System 1 is fast, automatic, and intuitive while System 2 is slow, deliberate, and effortful.

Step 1

Predict first

In one or two sentences, what do you think this concept means? Wrong is fine; the small struggle is what makes the answer stick.