the main memory is usually known as RAM.it stores the data & instructions currently needed by CPU but it operates at a very high speed.therefore, the memory should be fast otherwise there will be a speed mismatch between the two& it may led to the wastage of processing time of CPU.to overcome this a very fast memory CACHE MEMORY is placed between the two. so CACHE MEMORY is used to operate at the speed of CPU.it also increases the operating speed.
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