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Definition from webopedia: portion of memory made of high-speed static RAM (SRAM) instead of the slower and cheaper dynamic RAM (DRAM) used for main memory. Memory caching is effective because most programs access the same data or instructions over and over. By keeping as much of this information as possible in SRAM, the computer avoids accessing the slower DRAM.

So basically, to have a faster form of RAM for data to be stored in to so the CPU doesn't have to constantly write and re-write into DRAM. Also distance plays a factor in the speed to the access times. Cache is either on or in between the the slower DRAM. The shorter the distance the faster the access times.

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