What is The bool why we use this?

Hi there

We can use "1, 0 " instead of " true, false " cuz “0, 1” are lightweight in databases and also for compile,
so what is the reason of existing “bool”?
Probably your some of the columns in SQL are “true or false” but u need to know if u want to have the Third mode, u not be able. Is that, right?

Thanks in Advance

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