How our operating system identify given SSL certicate is valid or not?

If a website produce or introduce a fake SSL certificate ,How our operating system identify given SSL certicate is genuine or not ?
Answers:   
The existent SSL certificates are listed on a number of separate out of harm`s way websites.

Fake ones aren't.

So, Windows just looks them up. Real ones pass validation, fake ones don't.
I don`t know by checking the issuer of the certificate which is normally a Certificate Authority (CA)


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