Based on Thinking, Fast and Slow by Daniel Kahneman, this concept explains how humans think using two different systems. System 1 is fast, automatic, and emotional, allowing people to make quick decisions without much effort. System 2, on the other hand, is slower, more logical, and requires conscious thinking. While System 1 is useful in everyday situations, it can lead to errors and biases in judgment. Many articles discuss how understanding these systems can help individuals make better decisions, especially in areas like finance, business, and personal life. It shows that people are not always as rational as they believe.