A virtual machine is an emulation of a physical computer system within a software environment. It allows users to run multiple operating systems on a single physical machine, providing the ability to run applications that are not compatible with the host operating system. Virtual machines are commonly used for software development, testing, and running legacy applications. They offer benefits such as increased flexibility, scalability, and cost savings compared to running multiple physical machines. Popular virtual machine software includes VMware, VirtualBox, and Microsoft Hyper-V.
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