Creating VMs, Vnets, and NSGs in Azure represents an example of IaaS, which is a service model offering virtualized computing resources over the internet and allows users to manage platforms and applications on rented hardware.
When you, as an IT administrator, create virtual machines (VMs), virtual networks (Vnets), and network security groups (NSGs) in Azure, this is indeed an example of Infrastructure as a Service (IaaS). In Azure, IaaS provides the virtualized computing resources over the internet. It is a cloud service model that allows users to rent hardware, network, and storage capacity, and run their own platforms and applications.
By utilizing Azure IaaS, you can avoid the expense and complexity of buying and managing physical servers and other datacenter infrastructure. Each resource is offered as a separate service component, and you only need to rent a particular resource for as long as you need it. A subscription to Azure IaaS enables flexibility, scalability, and cost-effectiveness, as well as infrastructure management, which is still partially in the hands of the user.