[JS] Why is NaN !== NaN true?

Question

console.log(NaN!==NaN); // returns true, but why?

Answer 1

https://www.sololearn.com/discuss/384400/?ref=app
https://www.sololearn.com/discuss/356018/?ref=app
https://www.sololearn.com/discuss/339049/?ref=app

Answer 2

Thank you very much Ben!
So as from what I read it is just a Definition, nothing logical. I'll keep that in mind.
NaN == NaN => false