Azure has several hierarchical levels.
From a technical perspective, the order is (highest first):
Subscription (PROD, DEV, ...).
Resource Group (grouping everything related to a service , like firewall, servers, ...)
Inside Resource Group we can have
- VMs
- interfaces
- disks
-Virtual Networks
- a VNET contains a big subnet which can then be split into smaller subnets.
- Peering between VNETs
- A routing table
- Network Security Group (Rules inbound outbound)
- NAT Gateway
- IP addresses
