What is Azure Virtual Machines? A plain-English explainer
Azure Virtual Machines (Azure VMs) is Azure’s core infrastructure-as-a-service compute offering: it gives you virtual servers that run in Microsoft’s data centres, which you configure, use and resize as needed instead of buying and racking physical hardware. You choose an operating system, launch a machine within minutes, and pay for the capacity you consume rather than for hardware sitting idle. Azure VMs is infrastructure-as-a-service (IaaS) — Microsoft owns and runs the underlying physical infrastructure, and you get a virtual machine you control from the operating system upward. It is one of the first services introduced in Azure certification study, because it demonstrates the basic promise of cloud computing more directly than almost anything else: capacity on demand, with no hardware to buy. Here is what a VM actually gives you, what falls to you versus Azure, and how it lines up against other clouds’ equivalents.
What a cloud virtual machine actually is
A virtual machine is a software-based computer created by splitting a physical server into multiple isolated, independent machines, each with its own operating system, storage and network connection. The technology underneath this is virtualisation — our what-is-virtualization explainer covers the mechanism in depth — but the practical result is what matters day to day: a machine that behaves like dedicated hardware, without Azure having to hand you an entire physical server.
You choose the operating system — a Linux distribution or Windows Server — and from there it behaves like any server you fully control: install software, open network ports, attach storage, run whatever workload you need. The “elastic” part is that you are never locked into your first choice of size — you can resize an existing VM or add more as demand changes, which is the core difference from buying fixed physical capacity.
What you manage versus what Azure manages
Azure Virtual Machines follows the shared-responsibility model that runs through all IaaS: Azure is responsible for the physical hardware, the data centre, and the virtualisation layer that creates and isolates your VM. You are responsible for everything from the operating system upward — patching, security configuration, the software you install, and how you configure access to it.
That trade-off is the whole point of IaaS. You get far more control than a fully managed service would give you — the ability to install anything, configure anything — in exchange for taking on more of the operational work that a managed platform would otherwise absorb.
Common uses for Azure VMs
Because a VM is a general-purpose virtual server, it can run almost any workload: web applications and APIs, background processing, databases you choose to manage yourself, development and test environments, or legacy systems migrated from an on-premises data centre. It is the closest cloud equivalent to “give me a server”, which is why it remains the default starting point for workloads that do not fit neatly into a more specialised managed service.
A common pattern is running an application across several VMs behind a load balancer, so traffic spreads out and a single VM failing does not take the application down. Development teams also spin up temporary VMs that mirror production, then remove them once testing is done — something a physical server could never do on demand.
The Azure equivalent of EC2 and Compute Engine
Every major cloud provider offers essentially the same capability under a different name. Azure Virtual Machines is the direct counterpart to Amazon EC2 on AWS and Google Compute Engine on Google Cloud — all three give you resizable, general-purpose virtual servers billed by usage, built on the same virtualisation idea. The concepts transfer almost one-to-one between them, which is useful to know if you already have experience on another cloud, or expect to work across more than one.
Where the providers differ is mostly in naming, console layout, and the specific management tooling around the VM — the underlying idea of “rent a virtual server, pay for what you use” is consistent across all three.
How you pay for it, without the numbers
Azure VMs follows the pay-for-use model common across cloud compute: you are billed for the size of machine and the time it runs, rather than a fixed cost regardless of use. Machine sizes and pricing options change frequently, so this article deliberately avoids listing them — check Microsoft’s official Azure VM pricing page for current detail. The concept that matters is that stopping or resizing a VM you are not using is how cloud compute stays cost-efficient; capacity left running idle is capacity you keep paying for.
Where Azure Virtual Machines appears in certification study
Azure Virtual Machines is foundational enough to appear across Azure’s certification path. Microsoft Certified: Azure Fundamentals (AZ-900) introduces it conceptually as the canonical example of IaaS. Microsoft Certified: Azure Administrator Associate (AZ-104) goes considerably further — deploying, sizing, securing and managing VMs is a core part of the day-to-day administration the exam tests.
This article covers what Azure VMs are and why they exist — sizing families, availability options and management detail belong in the syllabus itself, which our /revision study library breaks down lesson by lesson for these certifications.
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