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Paging:

• Paging is one of the memory management schemes by which a computer can store and retrieve data from   secondary storage for use in main memory.
• In the paging memory-management scheme, the operating system retrieves data from secondary storage in same-size blocks called pages. The main advantage of paging is that it allows the physical address space of a process to be noncontiguous.
• systems had to fit whole programs into storage contiguously, which caused various storage and fragmentation problems.
• Paging is an important part of virtual memory implementation in most contemporary general-purpose operating systems, allowing them to use disk storage for data that does not fit into physicalrandom-access memory (RAM).