Cache Memory Cache memory is the fastest component in the memory hierarchy and approaches the speed of the CPU. A cache is organized between the CPU and the main memory to speed up the operation of a computer system. Some of the examples of the type of data or programs stored in cache may include: Table look up Code of functions Code of loops Array of data Advantage of using Cache: As the access time of cache memory is less than the access time of the main memory by a factor of  5 to 10, thus reducing the total memory access time. Locality of Reference: Cache is used to store the most frequently used instructions or data. Execution of a main program is in sequential order