Modern processors have a clock speed in the range of GHz while the main memory (DRAM) has a read/write speed in
the range of MHz, so the processor needs to halt till the memory completes its request. The halt period may seem to be very small,
but when seen on a broad scale, we see that most of the processor's time is wasted in the halt cycles. Cache memory is intended to
reduce the speed gap between the fast processor and slow memory. When a program needs to access data from the RAM
(physical memory), it first checks inside the cache (SRAM). Replacement policies are methods by which the memory blocks are
replaced in a filled cache. Cache replacement policies play a significant role in the memory organization of a processor and
dictate how fast a processor will receive the block demanded.
