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Paging Definition
1. In computer operating systems, paging is a memory management scheme by which a computer stores and retrieves data from secondary storage for use in main memory.
2. In this scheme, the operating system retrieves data from secondary storage in samesize blocks called pages.
Paging is an important part of virtual memory implementations in modern operating systems, using secondary storage to let programs exceed the size of available physical memory.
3. Noncontiguous memory allocation
4. Helps prevent external fragmentation
5. Logical address space is divided into equal size pages
6. physical address space is divided into equal size frames
7. Page Size = Frame Size

A. Logical Address or Virtual Address (represented in bits): An address generated by the CPU
B. Logical Address Space or Virtual Address Space( represented in words or bytes): The set of all logical addresses generated by a program
C. Physical Address (represented in bits): An address actually available on memory unit
D. Physical Address Space (represented in words or bytes): The set of all physical addresses corresponding to the logical addresses


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