I started reading:
where is says:
"At the end of the transactions defined in this protocol, the network device will have a private key and associated certificate that is issued by a CA. Applications on the device may use the key and its associated certificate to interact with other entities on the network."
I've used self-generated Private and Public keys in Windows and Linux before to encrypt and decrypt files with a 3rd party.
What is the difference between a certificate and the Private/Public key pair that I am have used before?