Page information in memory is also called as Page Table. The essential…

Answer: Page Frame number

Why: A page table maps virtual pages to physical memory. Each page table entry contains the physical frame number (page frame number) that identifies which physical frame stores that virtual page.

• Valid/present bit — indicates if the page is currently in physical memory.

• Protection bits — control read/write/execute permissions.

• Accessed/reference and dirty bits — track usage and whether the page has been modified.

• Optional fields — may include cache control, swap location, or other implementation-specific flags.

Note: The virtual page number is typically used to index into the page table and so is not stored redundantly in each entry. Therefore the essential content of a page table entry is the page frame number along with status/control bits.