Subnet or Supernet

I am sharing a topology, kindly find the screenshot

All servers and client computers are connected to the main site Firewall, and the IP details are mentioned.
On 2nd Site all client computers are connected to the second firewall and IP details are mentioned.
Site-2-Site VPN connection established between firewalls
Kindly pls clarify whether the concept is subnetting or Supernet, if so pls explain

Yes Class A 10.x.x.x is subnetted and site to site vpn helping connecting two different locations.

Site to Site commonly used in Industry to connect Headoffices with branch offices.

Ok and Thank You Sir