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The virtual machine is a clone of the physical machine. You can use any of the numerous virtualization software such as Oracle VirtualBox or VMware.
A virtual machine app creates a virtualized environment—called, simply enough, a virtual machine—that behaves like a separate computer system, complete with virtual hardware devices. The VM runs as a process in a window on your current operating system. You can boot an operating system installer disc (or live CD) inside the virtual machine, and the operating system will be “tricked” into thinking it’s running on a real computer. It will install and run just as it would on a real, physical machine. Whenever you want to use the operating system, you can open the virtual machine program and use it in a window on your current desktop.
Virtual machines allow you to run an operating system in an app window on your desktop that behaves like a full, separate computer. You can use them play around with different operating systems, run software your main operating system can’t, and try out apps in a safe, sandboxed environment.
You can also run multiple VMs at the same time, but you’ll find yourself somewhat limited by your system resources. Each VM eats up some CPU time, RAM, and other resources.
There are several good free virtual machine (VM) apps out there, which makes setting up a virtual machine something anybody can do.
There are several different virtual machine programs you can choose from and installation dependa on virtual machines but usually you need to open installation package and then configure all :
• (Windows, Linux, Mac OS X)VirtualBox is very popular because it’s open-source and completely free. There’s no paid version of VirtualBox, so you don’t have to deal with the usual “upgrade to get more features” upsells and nags. VirtualBox works very well, particularly on Windows and Linux where there’s less competition, making it a good place to start with
• (Windows, Linux): VMware has their own line of virtual machine programs. You can use VMware Player on Windows or Linux as a free, basic virtual machine tool. More advanced features—many of which are found in VirtualBox for free—require upgrading to the paid program.
• (Mac OS X): Macs also have Parallels Desktop available. Both Parallels Desktop and VMware Fusion for Mac are more polished than the virtual machine programs on other platforms, since they’re marketed to average Mac users who might want to run Windows software.
it is simply a imaginary machine created to install two or more operating systems on same machine and created on basis of hard drive type pf operating system memory and hard drive size
VM machine is an abstraction of the underlying physical resources like processor,CPU and memory to generate multiple virtual machines running on one physical server enabled by a hypervisor layer.
VMs can be installed by a hypervisor platform and spiing VM s from there