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| From [http://en.wikipedia.org/wiki/Virtualization Wikipedia], the free encyclopedia
| | [[Category:Installation Tutorials| Virtualization]] |
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| | | If you do not know about virtualization, read [[Intro to virtualization]] |
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| In computing, virtualization is a broad term that refers to the abstraction of computer resources:
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| * Virtual machine (VM), a software implementation of a machine (computer) that executes programs like a real machine
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| o Platform virtualization, which separates an operating system from the underlying platform resources
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| + Full virtualization, sensitive instructions replaced by binary translation or trapped by hardware - all software can run in the VM, e.g. IBM's CP/CMS, VirtualBox, VMware Workstation
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| + Hardware-assisted virtualization, CPU traps sensitive instructions - runs unmodified guest OS; used e.g. by VMware Workstation, Xen, KVM
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| + Partial virtualization, for specific applications rather than the operating system
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| + Paravirtualization, a virtualization technique that presents a software interface to virtual machines that is similar, but not identical, to that of the underlying hardware, thereby requiring guest operating systems to be adapted
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| + Operating system-level virtualization, a method where the operating system allows for multiple user-space instances (virtual hosting, chroot jail + resource management)
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| o Application virtualization, the hosting of individual applications on alien hardware/software
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| + Portable application, a computer software program that runs from a removable storage device as a USB flash drive
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| + Cross-platform virtualization, allows software compiled for a specific CPU and operating system to run unmodified on different CPUs and/or operating systems
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| + Virtual appliance, a virtual machine image designed to run on a virtualization platform
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| + Emulation or simulation
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| * Virtual memory, which allows uniform, contiguous addressing of physically separate and non-contiguous memory and disk areas
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| * Storage virtualization, the process of completely abstracting logical storage from physical storage
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| * Network virtualization, creation of a virtualised network addressing space within or across network subnets
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| * Virtual private network (VPN), a computer network in which some of the links between nodes are carried by open connections or virtual circuits in some larger network(s), such as the Internet
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| * Memory virtualization, aggregates RAM resources from networked systems into virtualized memory pool
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| * Desktop virtualization, the remote manipulation of a computer desktop
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| * Timeline of virtualization development, further work in this area
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If you do not know about virtualization, read Intro to virtualization