A virtual machine is a software-based emulation of a physical computer that runs on a host machine. It allows multiple operating systems to run on a single physical machine, making it more efficient in terms of resource utilization and management. Virtual machines are commonly used for testing software, running legacy applications, and creating isolated environments for security purposes. They can be created, configured, and managed using virtualization software such as VMware, VirtualBox, and Hyper-V.
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