What is VPS?
Also known as: Virtual Private Server
A Virtual Private Server (VPS) is a virtualized instance on a physical server that provides dedicated CPU, RAM, and storage, offering isolation and performance similar to a dedicated server at a lower cost.
A Virtual Private Server (VPS) is a virtual machine sold as a service by an Internet hosting provider. It runs its own copy of an operating system, and customers have superuser-level access to that OS instance. The virtualization technology, typically a hypervisor such as KVM, Xen, or VMware, partitions the physical server into multiple isolated environments, each with guaranteed resource allocations. This gives the user the experience of a dedicated server without the expense of owning the hardware.
The hypervisor abstracts the underlying hardware and allocates a fixed portion of CPU cores, memory, and disk space to each VPS. These allocations are dedicated, meaning one VPS's activity does not affect the performance of another, unlike shared hosting where resources are contested. The VPS can be rebooted independently, and providers often include features like snapshots, backups, and the ability to reinstall the operating system. Resource limits are enforced by the hypervisor, so a VPS with 2 vCPUs and 4 GB of RAM will always have that amount available, even if neighboring VPSes are under heavy load.
VPS hosting occupies a middle ground between shared hosting and dedicated servers. It is commonly used for websites with moderate traffic, application hosting, development and staging environments, and as a stepping stone to cloud infrastructure. Compared to shared hosting, a VPS offers more control, security, and performance predictability. Compared to a dedicated server, it is more affordable and easier to scale, as resources can often be upgraded without migrating physical hardware. Many cloud providers also offer VPS-like instances under different names, but the core concept remains the same: a virtualized slice of a server with dedicated resources.
Key facts
- A VPS uses hypervisor-based virtualization to partition a physical server into multiple isolated virtual machines.
- Each VPS has dedicated CPU, RAM, and disk allocations that are not shared with other tenants.
- Users have root or administrative access, allowing full control over the operating system and software.
- VPS hosting is more scalable and reliable than shared hosting, with performance guarantees.
- Common virtualization technologies include KVM, Xen, and OpenVZ (container-based).
How it works in practice
Related terms
References
More in Hosting Types
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Bare-metal cloud is a service model that provisions dedicated physical servers on demand via API, giving users direct access to hardware without a hypervisor.
Burstable Billing
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Colocation
Colocation is a service where a provider rents physical space, power, cooling, and network connectivity in a data centre for customer-owned servers and hardware.
Dedicated Server
A dedicated server is a physical machine leased exclusively to one customer, offering full hardware control and no virtualization overhead for high-performance workloads.
Hypervisor
A hypervisor is a software layer that creates and runs virtual machines by abstracting and isolating physical hardware resources for multiple operating systems.
Managed Hosting
Managed hosting is a service where the provider handles server administration, including OS maintenance, security updates, backups, and application support, allowing clients to focus on their core business.
Overselling
Overselling is a hosting practice where providers allocate more resources (bandwidth, disk, CPU) than physically available, assuming customers won't all use their maximum simultaneously.