Virtual machine (VM)

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Software that emulates the behaviour of a physical computing device. For example, a virtual machine can simulate the characteristics of a real computer (memory, processor, hard disk, operating system, etc.), allowing it to run programs as the real computer would. Let’s take the example of four physical servers, each of which is used at 20%. You can replace them with a single physical server, which runs all four virtual machines and separates the available resources according to peak usage.