How to deploy client authentication(require) using F5's self-signed certificate

Hi ,

In the sol : https://support.f5.com/kb/en-us/solutions/public/14000/400/sol14499.html

To create the Client SSL profile, use the following command syntax: create /ltm profile client-ssl ca-file client-cert-ca cert key peer-cert-mode require

For example, to create a new Client SSL Profile sample-clientssl by using the client certificate client1-cert, the client key client1-key, require client certificate mode, and the trusted CA and Advertised Certificate Authorities is clientCA-cert, type the following command: create /ltm profile client-ssl sample-clientssl ca-file clientCA-cert.crt client-cert-ca clientCA-cert.crt cert site-cert.crt key site-key.key peer-cert-mode require

What are these certificates? ( site-cert.crt key site-key.key )

Thank you