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== Types of Virtualization == Some common applications of virtualization are listed below; this list reflects the extreme diversity that the term has come to encapsulate. === Emulation === A software emulator allows computer programs to run on a platform (computer architecture and / or operating system) other than the one for which they were originally written. Unlike simulation, which only attempts to reproduce a program's behavior, emulation attempts to model to various degrees the state of the device being emulated. The virtual machine simulates the complete hardware, allowing an unmodified OS for a completely different CPU to be run. This is also known as ''Dynamic Recompilation''. === Paravirtualization === Paravirtualization is a virtualization technique that presents a software interface to virtual machines that is similar but not identical to that of the underlying hardware. This requires operating systems to be explicitly ported to run on top of the virtual machine monitor (VMM) but may enable the VMM itself to be simpler and for the virtual machines that run on it to achieve higher performance. === Native Virtualization === Native virtualization is a virtualization technique where the virtual machine monitor or hypervisor only partially simulates enough hardware to allow an unmodified Operating System to be run in isolation, but the guest Operating System must be designed for the same type of CPU. === Operating System-Level Virtualization === Operating System-level Virtualization is a server virtualization technology which virtualizes servers on a operating system (kernel) layer. It can be thought of as partitioning a single physical server into multiple small computational partitions. Each such partition looks and feels like a real server, from the point of view of its owner. On Unix systems, this technology can be thought of as an advanced extension of the standard chroot mechanism.
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