Input and output devices allow users to interact with computers. Common input devices include keyboards and mice which allow users to enter text and select items. Output devices such as monitors display information and printers produce hard copies. Storage devices like hard drives, CDs, DVDs, and USB drives are used to save data on the computer.

1. INPUT / OUTPUT DEVICES

2. INPUT / OUTPUT DEVICES
 Input / output devices are required for
users to communicate with the computer.
 In simple terms, input devices bring
information INTO the computer and
output devices bring information OUT of a
computer system.

3. Input Devices
 An input devices is used to enter the data and instructions into the computer.
Keyboard and mouse are the most commonly used input devices.
 Keyboard: Keyboard is the most popular
input device that allows user to type
alphabets, numbers and operators.
 Mouse: Mouse is a pointing device that
allows user to point to a specific location
on the screen. It has two or three buttons
on the top for selecting / executing
different operations. Pressing buttons of
mouse is called clicking. The arrow
showing the position of mouse on screen
is known as mouse pointer.

4. Other Input Devices
 Joystick is a device used to
control cursor on the screen.
Normally it is used in Games.
 Scanner is a device used to
capture digital images of printed
documents, graphics or other
printed media.
 Microphone is device used to
accept audio inputs from the
user.

5. Other Input Devices
 Touch Screen is a display
device, which is touch
sensitive and allows user to
interact with the computer
system by touching an area
on the screen.
 Web Camera is a digital
camera normally employed
for transfer of images on
the video conference.

6. Output Devices
 Monitor is an output device very similar
to the television screen. It displays the
information as it is typed and also
display the processed result or output.
 Printer is an output device to produce
paper copy (hard copy) for a document,
pictures etc.
 Speaker is a hardware device
connected to a computer sound card
that output sound generated by the
computer.

7. Storage Devices
 Storing data is an important part of a computer system. The main concern
of all computer designers is to create fast and efficient storage devices.
 Hard Disk Drive: It is a storage device with
very large capacity(64 GB to Terabytes).
There can be one or more hard disk in a
computer system.
 CD (Compact Disk): It is a storage device
with medium capacity(700 MB). It can
store data, audio and video. CD – Drive
has a laser light source that reads data
from the CD-ROM.

8. Other Storage Devices
 DVD (Digital Versatile Disc) is a special
drive used for placing and running
DVDs. It has a larger data storage
capacity (4.7 GB) then CD.
 Blue – Ray Disc (BD) was developed for
recording and playback of high-
definition video (HD), as well as storing
large amount of data. It has a large
storage capacity (25 GB)
 Pen Drive is a flash memory which is
plug into the USB port of computer. It is
more reliable then disk drive.