A virtual network should be thought of as a physical LAN network in your office or home. Conceptually, they both are the same, although the Azure virtual network is implemented as a software-defined network backed up by a giant physical network infrastructure.
A virtual network is required for hosting a virtual machine. They provide a secure communication mechanism between Azure resources to connect to each other. They provide an internal IP address to them, access, and connectivity to other resources including virtual machines on the same virtual network, routing of requests, and connectivity to other networks.
A virtual network is contained within a resource group and is hosted within a region, for example, West Europe. Virtual network cannot span multiple regions, but it can span all data centers with a region. For connectivity across regions, virtual networks...