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A virtual machine is a software-based emulation of a physical computer that operates in a completely isolated environment. It allows users to run multiple operating systems on a single physical machine, making it possible to run applications that are not natively supported on the host system.
Virtual machines are commonly used in cloud computing environments, where multiple virtual machines can be deployed on a single physical server to maximize resource utilization and improve scalability. They are also used for software testing, development, and running legacy applications.
Some popular virtual machine software include VMware, VirtualBox, and Microsoft Hyper-V. These tools provide a platform for creating and managing virtual machines, allowing users to allocate resources, install operating systems, and run applications within the virtual environment.