misconception
A wrong idea or misunderstanding about how something works.
A misconception is a mistaken belief or wrong understanding about something. It's when you think you know how something works, but you've actually gotten it mixed up.
For instance, many people have the misconception that touching a frog gives you warts. Scientists have proven this isn't true: warts come from viruses, not frogs. Another common misconception is that lightning never strikes the same place twice. In reality, tall buildings like the Empire State Building get struck dozens of times each year.
Misconceptions often feel completely true because they make sense in a logical way, or because someone you trust told you, or because “everyone knows it.” But feeling certain doesn't make something correct. A student might have a misconception about how multiplication works and confidently give wrong answers until a teacher helps them understand the correct rule.
The tricky thing about misconceptions is that they can be hard to fix. Once an idea lodges in your brain, replacing it with the correct information takes real effort. That's why scientists, teachers, and researchers spend time identifying common misconceptions and figuring out how to clear them up. Recognizing that you have a misconception isn't embarrassing: it's the first step toward actually understanding something correctly.