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The Dunning‑Kruger Effect is a cognitive bias in which individuals with low knowledge or skill in a particular area significantly overestimate their competence, while individuals with higher levels of expertise may underestimate their own abilities. This bias occurs because people who lack skill in a domain also lack the metacognitive ability to recognize their own limitations. In other words, they do not know enough to realize what they do not know.

What makes the Dunning‑Kruger Effect especially compelling is that it creates a "double burden": not only do low‑performing individuals make errors, but their overconfidence prevents them from seeking feedback or improvement. At the same time, more competent individuals tend to assume tasks are easier for others than they actually are, leading them to undervalue their own expertise or remain silent in group settings.

This effect has been observed across many domains, including education, leadership, workplace decision‑making, healthcare, and public discourse. In professional environments, it can contribute to poor decisions, resistance to training, and misplaced authority, particularly when confidence is mistaken for competence. Awareness of the Dunning‑Kruger Effect is often considered a critical step toward improving self‑assessment, learning, and effective leadership.