paging

The virtual-memory scheme that splits memory into fixed-size chunks and maps them flexibly.

Paging divides both virtual and physical memory into equal-size pages (commonly 4 KB) and lets the OS map any virtual page to any physical frame, or to disk. This gives each process its own contiguous-looking address space, enables isolation, and lets total memory usage exceed physical RAM by moving idle pages out. It's the backbone of modern memory management.