The hypervisor within a virtual private server is what divides the physical server into many different virtual servers. The hypervisor allows for true virtualization so that each owner of each virtual website can do whatever they'd like to their VPS. They can install their own operating system, and use their own drivers and software on their own VPS. This is not true with OS level virtualization. Because a hypervisor allows for true virtualization, nothing on a virtual private server will rely on any underlying software.
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