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How a VPS works
A VPS hosting provider relies on virtualization software, called a hypervisor, to abstract resources on a physical server and provide customers with access to an emulated server, called a virtual machine (VM). Each virtual machine runs a complete operating system, and has restricted access to a portion of the physical server's compute, memory and storage resources. Customers have access to the VM's OS, but not to the physical server.While multiple tenants can share VMs that reside on the same physical server, those VMs are restricted from interacting with VMs owned by other tenants, hence creating a server that is logically private, but not physically separate.
Advantages of VPS hosting
One of the primary advantages to using a VPS, as opposed to a traditional web hosting service, is that the subscriber has full access to the VPS's OS, with unrestricted root or administrator permissions. This level of access allows subscribers to configure the VPS to meet their own unique requirements.Disadvantages of VPS hosting
VPSs are commonly used by smaller organizations that want the flexibility of a dedicated server, but without the cost. Although a VPS can meet this requirement, it does have its disadvantages.The primary disadvantage to using a VPS is its lack of performance. The organization that provides the VPS will typically throttle the server's performance in an effort to maximize the number of VPSs that the physical server is able to accommodate. In the unlikely event that the VPS's performance is not throttled, it then becomes possible for an adjacent VPS to consume excessive resources, to the point of impacting the VPS's performance.

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