What is the name of the cognitive bias wherein a person with low ability in a particular skill mistake themselves as being superior?

The story behind the answer

Dunning–Kruger effect is the bias where people with low skill overestimate their competence because the very skills they lack are needed to recognize their own mistakes. David Dunning and Justin Kruger demonstrated this in 1999: participants who scored lowest in humor, grammar, and logic tests rated themselves far above average, revealing a metacognitive blind spot.

It’s a “double curse”: poor performers don’t know enough to do well or to see that they didn’t. Conversely, highly competent people sometimes underestimate themselves because they assume tasks are easy for everyone. Memory hook: “Dun-ning know you’re wrong?”—if you lack know-how, you may lack know-that-you-lack. (Don’t confuse this with the Müller–Lyer effect, a visual illusion, unrelated to self-assessment.)