Give several reasons why it is useful to separate a process’s virtual memory space from its physical memory space.

What will be an ideal response?

For one thing, if the spaces were identical, there would be little point in having a virtual
memory space. The separation gives users the freedom to write programs much larger
than physical memory, frees them from worry about memory management such as overlays
and enables the interuser protection mechanisms which are such a nice feature of virtual
memory systems.