Virtual networks
Virtual networks should be thought of like a physical office or home LAN network setup. Conceptually, they are the same, although Azure Virtual Network (VNet) is implemented as a software-defined network backed up by a giant physical network infrastructure.
A VNet is required to host a virtual machine. It provides a secure communication mechanism between Azure resources so that they can connect to each other. The VNets provide internal IP addresses to the resources, facilitate access and connectivity to other resources (including virtual machines on the same virtual network), route requests, and provide connectivity to other networks.
A virtual network is contained within a resource group and is hosted within a region, for example, West Europe. It cannot span multiple regions but can span all datacenters within a region, which means we can span virtual networks across multiple Availability Zones in a region. For connectivity across regions, virtual networks...