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💻 '''Virtual machine (VM)''' is a software-based emulation of a physical computer that runs an operating system and applications in an isolated environment, sharing the underlying hardware of a host server with other virtual machines through a hypervisor. In insurance IT operations, virtual machines are the fundamental building blocks of modern infrastructure: they host everything from [[Definition:Policy administration system (PAS) | policy administration systems]] and [[Definition:Claims management system | claims platforms]] to [[Definition:Actuarial modeling | actuarial modeling]] environments and [[Definition:Regulatory reporting | regulatory reporting]] tools. By abstracting computing workloads from physical hardware, VMs give insurers the flexibility to run multiple isolated systems on shared infrastructure — a capability that has transformed how carriers manage their technology estates.

🔧 Each virtual machine operates as if it were a self-contained computer, with its own allocated portion of CPU, memory, storage, and network resources, governed by a hypervisor such as VMware ESXi, Microsoft Hyper-V, or KVM. An insurer's IT team can spin up a new VM in minutes — to create a testing environment for a [[Definition:Core system transformation | core system upgrade]], provision a sandbox for an [[Definition:Insurtech | insurtech]] integration pilot, or deploy an additional instance of a web application to handle traffic spikes during [[Definition:Renewal | renewal]] season. VMs can be snapshotted before a [[Definition:Release management | software release]], allowing instant rollback if the deployment introduces defects. They can also be live-migrated between physical hosts for maintenance without interrupting service — a capability that supports the high-availability requirements of systems processing [[Definition:Claim | claims]] payments or real-time [[Definition:Quoting | quoting]]. In [[Definition:Cloud computing | cloud]] environments, VMs are the primary unit of compute that insurers provision from providers like AWS, Microsoft Azure, and Google Cloud, making the concept central to both [[Definition:On-premises infrastructure | on-premises]] and cloud-based insurance technology strategies.

📊 Virtual machines have been indispensable to the insurance industry's technology evolution over the past two decades. Before [[Definition:Server virtualization | virtualization]] became standard practice, insurers routinely maintained one physical server per application — a model that was expensive, wasteful of hardware capacity, and cumbersome to scale. The shift to VM-based infrastructure allowed carriers to consolidate hardware, reduce [[Definition:Data center | data center]] footprints, and improve [[Definition:Disaster recovery | disaster recovery]] capabilities significantly. Today, while containerization technologies such as Docker and Kubernetes offer an even lighter-weight alternative for certain workloads, VMs remain the dominant execution environment for the legacy and mid-generation applications that constitute the majority of most insurers' technology landscapes. Understanding virtual machines is essential for anyone involved in insurance technology decisions — from infrastructure architects planning [[Definition:Cloud migration | cloud migrations]] to business leaders evaluating the cost and risk trade-offs of different deployment models.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Server virtualization]]
* [[Definition:Cloud computing]]
* [[Definition:On-premises infrastructure]]
* [[Definition:Disaster recovery]]
* [[Definition:Microservices architecture]]
* [[Definition:Private cloud]]
{{Div col end}}

Definition:Virtual machine (VM) - Revision history

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