Azure Virtual Network
Azure Virtual Network is a cloud service that permits you to define your own virtual network on the cloud (full control of IP addresses, DNS, routing, security, and so on). This is a useful cloud service for connecting your on-premises network to your own network in the cloud and so using cloud resources (for example, virtual machines) exactly like a computer in your network.
A virtual network can be created directly by going to the Azure Portal and navigating to New | Networking | Virtual network:
If you plan to use Azure VM or some Azure services in your NAV solution architecture, this is a service that is often required (especially for joining the VM to your on-premise resources).