Demand paging
Main memory (physical address space) as well as user address space (virtual address space) are logically partitioned into equal chunks known as pages. Main memory pages (sometimes known as frames) and virtual memory pages are of the same size.
Virtual address (VA) is viewed as a pair (virtual page number, offset within the page). Example: Consider a virtual space of 16K , with 2K page size and an address 3045. What the virtual page number and offset corresponding to this VA?