A virtual machine, or VM, is a software-based emulation of a physical computer, running its own operating system and applications as though it were an entirely independent, standalone machine — even though it's actually running on shared physical hardware alongside other VMs.
How Virtual Machines Work
A hypervisor — software specifically designed to manage virtual machines — allocates a defined slice of a physical server's actual resources (CPU, RAM, storage) to each individual VM, letting several completely separate, isolated environments run simultaneously on the very same physical hardware.
Where VMs Are Commonly Used
- VPS hosting — each VPS is, at its core, a virtual machine
- Local development environments — testing different configurations in isolation
- Cloud computing services like AWS EC2, built entirely around virtual machines
- Software testing across multiple different operating systems
VMs vs. Containers
VMs include a complete, full operating system for each individual instance; containers (like Docker) share a single host operating system while still keeping each application genuinely isolated — generally making containers considerably more lightweight and efficient than full VMs.
Relevance to WordPress Hosting
VPS hosting for WordPress is fundamentally built on virtual machine technology — it's what allows a hosting provider to sell dedicated, guaranteed resources to individual customers without needing to provide an entire, separate physical server for each and every one.
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