理解physical page||main memory in Computer

• Page

  A page, memory page or virtual page is a fixed-length contigous block of virtual memory, described by a single entry in the page table.

  It is the smallest unit of data for memory mangement in a virtual memory OS.

  A page frame is the smallest fixed-length contiguous block of physical memory into which memory pages are mapped by the OS.

  A transfer of pages between main memory and an auxiliary store, such as a hard disk drive, is referred to as paging or swapping.

• Page table

  A page table is the data structure used by a virual memory system in a computer OS to store the mapping between vir