OS General Concepts Question:
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What is virtual memory?
How we can increase or decrease the virtual memory?

Answer:

Virtual memory are a part of operating sysytem in which
whenever ram have no space to execute any process than
operating system uses some part of hard disk as a ram.
Those part of memory known as virtual memory because this
is virtually created by operating system whenever needed.
This memory created by operating system in big companies in
which more process executes and ram have no space because
they contain more process already. Most operating systems
contains this concept.

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