This article talks about how a certificate:
By signing a certificate, the CA tells I know this person or device: they are who they say they are
The processus is also known as issuing or producing a certificate.
A signed certificate is a certificate that have been signed
A certificate is insecure until it is signed, as only a signed certificate cannot be modified.
Only a certificate signed by a third Certificate Authority assure the authenticity of the owner.
The certificate can then be used:
To get a certificate to install it on your own infrastructure, the process is the following:
You can sign it your self if you act as a Certificate Authority ( CA ). See: Cryptography Certificate - How to self-signed a Certificate (for a test or internal server)
You can automate the process with acme client
After getting a certificate from your Certificate Authority (CA), you can enable SSL communcation by installing your private key together with the received Certificate on: