What stands for 'VMem' shown in 'stat detailed'

It seems that ‘VMem’, mentioned in red-square, stands for Virtual Memory.


This picture is the sample project, ‘Electric Dream’.

I am wondering how ‘VMem’ works in Unreal Engine…
It has 24.95GB, instead of my machine has 16GB of physical memory.

Is this the total of data which should be loaded in memory layed in the World Partition ?

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