Why do we get a “SSL Error – Certificate Not Trusted” ?

Have you ever wondered while you  access a website through a secure connection , you happen to get a  warning  message that the certificate is not issued by a trusted authority.

In most cases , the  exact warning message  that you will get depends on your browser as follows:

I E   The security certificate presented by this website was not issued by a trusted certificate authority.!

Firefox The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer)

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