OSPF Process ID

in CCNA & CCENT
Hi,
Are there instances where they are more than 1 process id on the same ospf router?
If so, why will someone do that?
Are there instances where they are more than 1 process id on the same ospf router?
If so, why will someone do that?
Comments
But I thought vrf is necessary at PE routers to distinguish between customer routes?
And yes VRF is used by service providers in their network for layer 3 VPNs, usually with either a MPLS backbone, or a MP-BGP backbone connecting said PE routers together. VRF isn't used for layer 2 VPNs though.
Why should someone create more than 1 instance of an OSPF process if they populate the same routing table?
What is the command to show that they are in separate databases?
"show ip ospf 1 database" or "show ip ospf 2 database"
As an example, within an organization security department want to utilize the core infrastructure i.e. routers but use there own cards. You can create infrastructure links separate on each router which are utilized only by the security department. 2 ospf processes are configured, one for regular core and 1 for security. All security routes are isolated, no redistribution, no vrf required, no security issue with vrf leak. Shared RIB, but no default route, complete isolation on the same physical router without relying on software vrf.
do you want elaborating on the sentence "use their own cards" ?