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A virtual machine (VM) is a software-based, digital computer that runs inside a physical computer, acting as an isolated, independent system with its own OS, CPU, memory, and storage, allowing you to run multiple operating systems (like Windows on a Mac) or create safe, separate environments for testing and development, all managed by software called a hypervisor. VMs improve resource use, security, and flexibility, forming the foundation for cloud computing.
Host & Guest: A physical computer (the "host") runs virtualization software (a "hypervisor"), which creates and manages one or more "guest" virtual machines.
Resource Allocation: The hypervisor allocates slices of the host's physical CPU, RAM, and storage to each VM.
Isolation: Each VM operates independently, so an issue in one VM doesn't affect the host or other VMs.
Key Benefits & Uses
Testing & Development: Create safe, isolated "sandboxes" to test software or risky apps without harming your main system.
Server Consolidation: Run many virtual servers on one powerful physical server, saving hardware costs
Disaster Recovery: Use VM snapshots for quick backups and rollbacks.
Cloud Computing: Cloud providers use VMs to offer scalable, on-demand computing power to users.
Oracle VirtualBox: Popular free software for desktops.
VMware: A leader in enterprise and desktop virtualization. Subscription and Fees involved.
Last review/update: 23/12/25
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