INTRODUCTION:
Virtual memory managers provide an abstraction of the physical memory by creating a virtual address space in the secondary memory and then automatically determining the part of the address space to be loaded into primary memory at any given time. The system handles the transfer of address space blocks back and forth between primary and secondary memories without manual intervention.

CONCEPTS:

The concept of virtual memory is implemented by demand paging. In Virtual memory systems, when a new process is initiated, the system loader must load at least one page into real memory.