CPU

CPU   stand for central processing unit. The central processing unit is generally referred to as the brain of the computer. The primary work of cpu is to convert data from intput,process the data and output in useful infomation that can be use by either user or other  computer program.Central processing unit(CPU) is a highly complex set of electronic circuitry that executes program instructions. It is like a really fast calculator that has the ability to recall numbers from various locations in memory, perform arithmetic and logical operations with them, such as addition or multiplication, and then store the results.

HARDWARE

The Physical Part of computer that you can touch and feel are know as COMPUTER HARDWARE in a broader sense a computer can be divided into following units:                                               

1.INTPUT UNIT

2.OUTPUT UNIT

3.SYSTEM UNIT