The Virtual Memory: Available parameter specifies the allocatable memory of the operating system.
When the virtual memory is used, the system can release sufficient RAM space so that programs can run properly. However, when the RAM is insufficient, the Windows operating system moves information stored in the RAM to the page file (virtual memory) on the hard disk.
According to the memory management mechanism of the Windows operating system, the computer has two types of memory: physical memory (RAM) and virtual memory.