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01 THE COMPUTER—
AN OVERVIEW
Your Aim
to learn about:
l Working of a Computer l Input Devices
l Processing Device l Output Devices
As you know, a computer system is made up of two parts—Hardware and Software.
The parts of a computer that we can see and touch are called Hardware.
A computer needs instructions to do anything. These step-wise instructions are
called software.
WORKING OF A COMPUTER
A computer works on the IPO (Input-Process-Output) cycle. It receives input from
the user through input devices, processes the input using the CPU and gives back
the output using output devices. This process is known as IPO cycle.
Input devices Processing device Output devices
IPO Cycle
INPUT DEVICES
A computer accepts data and instructions from you through the input devices. Data
can be in the form of numbers, text, sounds or graphics.
The Computer—An Overview 7

