signed vs. encrypted cert or signed message

What does it mean for a cert or even a message to be signed

What is the difference between being signed and being encrypted?
Anthony LuciaAsked:
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Pasha KravtsovConnect With a Mentor Support EngineerCommented:
The only difference is the value of the purpose field in the certificate. The issuer of the certificate chooses for what purpose the certificate is created.
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Pasha KravtsovConnect With a Mentor Support EngineerCommented:
In cryptography and computer security, a self-signed certificate is an identity certificate that is signed by the same entity whose identity it certifies. This term has nothing to do with the identity of the person or organization that actually performed the signing procedure. In technical terms a self-signed certificate is one signed with its own private key.
What this is supposed to do is verify that you are actually connecting or receiving the cert from who you are connecting to through SSL.
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Anthony LuciaAuthor Commented:
So as I understand it you 'sign' a cert with a private key, and you decrypt with a private key

But what is the difference between a signed cert and an encrypted cert?   Possibly a hash or check sum ?
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