What is the Dunning-Kruger Effect?

This video describes the Dunning-Kruger effect. This effect is when individuals who are incompetent at a specific task overestimate their performance on a test of that task. The Dunning-Kruger effect is also observed when experts tend to underestimate their ability. The Dunning-Kruger effect has been observed in studies on tests of grammar, social abilities, logic, reasoning, humor, and many other areas.