there is only one hardware memory device and this "virtual" device acts like a RAM module.In computing, virtual memory is a memory management technique developed for multitasking kernels this technique virtualizes a computer architecture's various hardware memory devices (such as RAM modules and disk storage drives), allowing a program to be designed as though: The program thinks it has a large range of contiguous addresses but in reality the parts it is currently using are scattered around RAM, and the inactive parts are saved in a disk file.
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