What is memory paging, and how can it facilitate virtual memory?

Memory paging is a memory management technique that controls how memory resources are used and shared by the operating system.

The virtual memory is an alternate set of memory addresses that operating systems in conjunction with the hardware reserve to expand the total amount of addresses (real memory + virtual memory). When the program is actually executed, the virtual addresses are converted into real memory addresses.

The operating system divides virtual memory into pages to facilitate copying virtual memory into real memory, each of which contains a fixed number of addresses. When the page is needed, the operating system copies it from disk (virtual memory) to the main memory (real memory), translating the virtual addresses into real addresses.