Simply; For example, I have website “mysite.com” on CF. This website of mine uses the IP address “108.162.192246” owned by CF. I want to continue hosting my website on CF and use a static IP of my own. For example “X.X.X.X”
Furthermore, you can point your DNS records to your IPs, however if it’s proxied DNS record, then the IP on the lookup should return the Cloudflare IP (IPv4 and IPv6).