Noun
virtual memory (usually uncountable, plural virtual memories)
(computing) Memory that appears to be RAM but is being simulated (by a process called paging) on a hard disk; allows a computer to operate as if it had more memory than it actually does, but with some loss of performance
Virtual memory was introduced to the x86 architecture with the protected mode of the Intel 80286 processor, but its segment swapping technique scaled poorly to larger segment sizes. Source: Internet
Virtual memory main further Many operating systems can "trick" programs into using memory scattered around the hard disk and RAM as if it is one continuous chunk of memory, called virtual memory. Source: Internet
Virtual memory systems usually include protected memory, but this is not always the case. Source: Internet
Virtual memory was not available in most IBM mainframes until the System/370 series. Source: Internet