The CPU is the brain of any PC.The CPU works by taking data out of memory,processing it,and placing it back into memory.it is through memory that the other devices that make up the PC interact with the CPU.it may be helpful if you think of the CPU as an agent,spending its time going from one device to another,asking if its help is needed.if the processing job is completed this process explains why some time you can type a con type a commend and it see ms.take a while for the computer to respond The Cpu was processing another instruction,and took a,moment for it to go to the keyboard's memory location,retrieve your key stroke,determine what keystroke meant,and execute the instruction.


                             Cache memory