What does Revoking a Certificate mean?

Revoking a certificate is invalidating it before the expiry date that appears on it. The revocation can be requested at any time, and in particular, when the holder things their private keys are known by others.
The revocation is effective from the effective date of revocation which appears together with the revoked certificate’s serial number in a document signed and published by the Certification Authority.
Any digital signature made with the private key associated with this certificate subsequently to the effective date of revocation will be void.