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In computing, a virtual machine (VM) is the virtualization or emulation of a computer system. Virtual machines are based on computer architectures and provide the functionality of a physical computer. Their implementations may involve specialized hardware, software, or a combination of the two.
A virtual machine implements functionality of a (physical) computer with an operating system. The software or firmware that creates a virtual machine on the host hardware is called a hypervisor or virtual machine monitor. [2] Software executed on these virtual machines is separated from the underlying hardware resources.
Internet-related prefixes such as e-, i-, cyber-, info-, techno-and net-are added to a wide range of existing words to describe new, Internet- or computer-related flavors of existing concepts, often electronic products and services that already have a non-electronic counterpart.
The creation and management of virtual machines has also been called "platform virtualization", or "server virtualization", more recently. [2] [3] Platform virtualization is performed on a given hardware platform by host software (a control program), which creates a simulated computer environment, a virtual machine (VM), for its guest software ...
VM—Virtual Machine; VM—Virtual Memory; VMM—Virtual Machine Monitor; VNC—Virtual Network Computing; VOD—Video On Demand; VoIP—Voice over Internet Protocol; VPN—Virtual Private Network; VPS—Virtual Private Server; VPU—Visual Processing Unit; VR—Virtual Reality; VRML—Virtual Reality Modeling Language; VSAM—Virtual Storage ...
Virtual private network (VPN) is a network architecture for virtually extending a private network (i.e. any computer network which is not the public Internet) across one or multiple other networks which are either untrusted (as they are not controlled by the entity aiming to implement the VPN) or need to be isolated (thus making the lower network invisible or not directly usable).
Networks, such as virtual LANs (VLANs) and containers such as virtual machines (VMs) Network storage devices; Network machine-to-machine elements, such as telecommunications devices; Network mobile elements, such as laptop computers, tablet computers, and smartphones; Network media, such as Ethernet and Fibre Channel
The virtual machine is unaware that it is an application and operates as if it had its own hardware. [14] [29] Virtual machines can be paused, saved, and resumed, making them useful for operating systems research, development, [30] and debugging. [31]