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Virtual Memory:

Virtual memory is a computer system technique which gives an application program the impression that it has contiguous working memory (an address space), while in fact it may be physically fragmented and may even overflow on to disk storage.

Developed for multitasking kernels, virtual memory provides two primary functions:

1. Each process has its own address space, thereby not required to be relocated nor required to use relative addressing mode.
2. Each process sees one contiguous block of free memory upon launch. Fragmentation is hidden.

How Virtual Memory Works?