Input devices such as keyboards, mice, scanners, and touchscreens convert human instructions and data into a format computers can understand. These devices allow users to enter information and control the computer. Output devices like monitors, printers, and speakers take the processed data from computers and present it to users in a human-readable form such as displaying images or playing sounds.

4. Computer cannot understand our language because it
understands only machine language and it can be
possible using some devices called input devices.
When we work with a computer, we enter data and give
instructions to the computer by using these devices.
These devices convert data and instructions into the form
that can be easily recognized by the computer.

5. MOUSE KEY -BOARD SCANNER
JOYSTICK MICRO-
PHONE LIGHT- PEN
TRACK-BALL
DIGITIZER TOUCH-
SCREEN

6.  It is the pointing device used
to insert instructions to the
Computers. It is hand held
device that controls the
pointer on the screen. It has
two buttons i.e. left and
right button and one
scrolling wheel. With the help
Of mouse you can draw images,
Select options and move and text
Images.

7. LASER
MOUSE
OPTICAL MOUSE

8.  A keyboard is the set of typewriter
like keys that enables you to enter data into
a computer and other devices.
 Computer keyboards are similar to electric-
typewriter keyboards but contain additional
keys.
 Keyboard is merely a collection
of momentary switches.

9. NORMAL
KEYBOARD
MULTIMEDIA
KEYBOARD
WIRELESS
KEYBOARD

10.  A scanner is a device that captures images
from photographic prints, posters, magazine
pages, and similar sources for
computer editing and display.
 Scanners come in hand-held,
feed-in, and flatbed types and
for scanning black-and-white
only, or colour.
SCANNER:

11. FLATBED
SCANNER
PHOTO
SCANNER
SHEETFED
SCANNERS

12.  A joystick is an input device consisting of a stick
that pivots on a base and reports its angle or
direction to the device it is controlling.
 Joysticks are often used to control video games,
and usually have one or more push-buttons whose
state can also be read by the computer.
 Joysticks are also used for
controlling machines such as
cranes, trucks, underwater
unmanned vehicles,.

13.  A micro-phone is an input device used to
inputting voice signal into the computer.
 Micro-phones are commonly used for live
chats.
 Micro-phones are also used to record voice in
the computer.

14. HEADSETS STAND-ALONE
WECAM INTEGRATED

15.  A light pen is a computer input device in the
form of a light-sensitive wand used in
conjunction with a computer's CRT display. It
allows the user to point to displayed objects
or draw on the screen in a similar way to a
touch-screen but with greater positional
accuracy.

16. o Track ball is an input device that is
mostly used in notebook or laptop
computer, instead of mouse.
o It looks like an upside-down mouse.
o The onscreen pointer is moved by the
trackball with a thumb or finger
o Since the whole device is
not moved, a track ball requires
less space than a mouse.

17.  Digitizer is an input device which converts analog
information into digital form. Digitizer can convert a
signal from the television or camera into a series of
numbers that could be stored in a computer. They can
be used by the computer to create a picture of
whatever the camera had been pointed at. Digitizer is
also known as Tablet or Graphics Tablet.

18.  Touch-screen is the easiest way to input data on the
computer. Touch-screen allow the user to select the
items by touching the screen at appropriate spot. The
screens are sensitive to pressure; a user interacts with
the computer by touching
pictures or words on the screen.

20.  Computer is fed with a lot of data to be
processed and organised.
 The data has been processed into useful form
is called output.
 Output is a result we get through output
devices.

21. PRINTER MONITOR SPEAKERS
PROJECTOR PLOTTER FLAT -PANEL

22.  A printer is any device that
prints text or illustrations on paper.
 A printer is a peripheral which makes
a persistent human readable
representation of graphics or text on
paper or similar physical media.

23. IMPACT
PRINTER
NON-
IMPACT
PRINTER

24. DOT-MATRIX DAISY-
WHEEL

25. LASER PRINTER INKJET
PRINTER

26.  A monitor or a display is an electronic visual
display for computers.
 The monitor comprises the display
device, circuitry and
an enclosure.
 The display device in modern monitors is
typically a thin film transistor liquid
crystal display thin panel, while
older monitors used a cathode
ray tube about as deep as the
screen size.

27.  Speaker is an important part of a computer
system. Some systems have a built-in speaker,
though they are small in size. Speaker is an
essential part of a computer because they can
notify about various system notifications
through various sounds.

28.  A projector or image projector is
an optical device that projects an image onto
a
surface, commonly a projection screen.
 Most projectors create an image by
shining a
light through a small transparent lens,
but some newer types of projectors
can project the image directly, by
using lasers.

29.  Plotter is a well known output device which
produce high quality graphics in multiple
colour. Plotter is used to create maps, charts
etc. on a paper sheet.
 A plotter gives a hard copy of the output.

30.  The flat-panel display refers to a class of video devices
that have reduced volume, weight and power
requirement in comparison to the CRT.
 You can hang them on walls or wear them on your wrists.
Current uses of flat-panel displays include calculators,
video games, monitors, laptop computer, graphics
display.

31. INPUT DEVICES OUTPUT DEVICES
 An input device is any hardware
device that sends data to a
computer, allowing you to
interact with and control the
computer.
 An input device can send data to
another device but it cannot
receive data from another device.
 Examples of input devices are
mouse, keyboard, scanner etc
 An output device is any
peripheral that receives data
from a computer, usually for
display, projection.
 An output device can receive
data from another device, but it
cannot send data to another
device.
 Examples of output devices are
printer, monitor, projector etc.