How data is received into a computer system,
and how information and the results of
processing are provided to the user from a
Used for taking data and entering it into a
Different types of input devices are designed to
accept different types of data.
2 types of data are human readable data and
machine readable data.
Automating data entry where the data is
created, thus ensuring accuracy and timeliness.
Used by librarians, many rental car companies
and other professionals.
Used to scan books and cars to collect data.
A device that is made to be used for a variety
of computing activities.
Keyboards, pointers, touch screens, multi-
touch displays and microphones are general
purpose input devices.
Provide data input for one specific type of
Game controllers, joysticks, webcams, page
scanners and handheld scanners are special
purpose input devices.
Businesses and organizations use special-
purpose scanners and optical readers to collect
Card swipers are another way of collecting
data into a computer.
Card swipers are used to verify the identity of
individuals wishing to access secure locations.
Allows a user to see
the results of
with one or more
Good output devices
deliver information in
a manner that allows
the information to be
consists of data results
that are observable by
human senses or that
can be used as input
into another system.
For example, iPod users
synchronize music from
their computer to the
iPod, with the output of
the computer acting as
input for the iPod.
Combine video processing and storage onto an
expansion card or onto the motherboard to
manage video images for display.
Video cards provide important capabilities for
today’s graphics-intensive software.
Also known as graphics cards.
Video cards manage all images sent to a
Devices that use video cards include:
Microsoft Windows Vista
Mac OS X
3D computer games
Provides visual computer output on a monitor
The most common form of computer output is
visual on a display
Cathode Ray Tube
Liquid Crystal Display
Thin flat display using
plasma gas between
two flat panels to excite
phosphors and create
Light Emitting Diode (LED)
utilize LEDs to provide the backlight for the display
rather than the fluorescent light used in traditional
uses pixels made of particles or oils that reflect light
to resemble the pages of a book.
provides a specific type of computer output on
paper or three-dimensional output in plastic.
The different types of printers are
Provide output to senses other than sight.
Sound is used by the computer operating
system and other software to make the user
aware of certain events.
Computer’s capacity to interface with external
devices by connecting through ports, slots, and
Expansion allows computer users to enjoy
benefits beyond those provided by the