A PC's main memory place (or primary storage) is fast storage space that is directly
accessible by the CPU. It is generally used for storing relatively short-term data needed for software
execution. Main memory is usually much faster than mass storage devices like hard disks or optical
discs, but usually cannot retain data for more than a few fractions of a second without power and is
more expensive. Therefore, it is not generally suitable for long-term or archival data storage. As
with the CPU, most PCs use some form of semiconductor random access memory such as DRAM
or SRAM as their primary storage.
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