Define virtual memory
Virtual memory is a memory management capability of an operating
system (OS) that uses hardware and software to allow a computer to
compensate for physical memory shortages by temporarily transferring
data from random access memory (RAM) to disk storage.
OR
Virtual memory is the separation of user logical memory from physical
memory.
This separation allows an extremely large virtual memory to
be provided for programmers when only a smaller physical memory is
available. Virtual memory makes the task of programming much easier,
because the programmer no longer needs to worry about the amount of
physical memory available, or about what code can be placed in
overlays, but can concentrate instead on the problem to be programmed
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