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3. • Information technology is the study of engineering
computer applications to support the operation of an
organization : operating , installing and maintaining
software and data.
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4.  COMPUTER
 COMMUNICATION TECHNOLOGY
MEMORY
 UNITS OF MEMORY
TYPES OF SOFTWARE
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5. A computer is a programmable electronic
device. It takes data through input devices. It
processes the data according to a sequence
of instructions provided in the form of a
program. The result is called the output and
given through some output device.
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6. • Communication technology is the study
of technology applications used in
telecommunications.
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7. MAIN MEMORY
• RAM is volatile.
• It is temporary memory.
• It has limited storage capacity.
• It is very expensive.
• It is not portable.
SECONDARY MEMORY
• It is non volatile.
• It is permanent memory.
• It has large storage capacity.
• It is cheaper .
• It is portable.
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Computer uses several different types of memory. They are : -
 INTERNAL MEMORY Main memory ( RAM )
Cache memory
 EXTERNAL MEMORY Secondary memory

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9. TYPES OF SOFTWARE
• SYSTEM SOFTWARE
APPLICATION SOFTWARE
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11. APPLICATION SOFTWARE
• Application software are a set of program
that are put together for specific purpose or
task. There are two types of application
software:-
• General Purpose Application Software
• Customized Software
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12. A local area network is a
computer network that
interconnects computers in a
limited area such as a home,
school, computer laboratory, or
office building using network
media .
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13. A wide area network (WAN) is
a network that covers a broad
area using
private or public network
transports.
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15. 1. COMMUNICATION
2. RESEARCH
3. BOOKING E- TICKETS
4. PLAYING GAMES
5. DOWNLOADING
6. CHATTING
7. TWITTER
8. SOCIAL
NETWORKING
9. ENTERTAINMENT
10. LISTEN SONGS
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16. • Ethernet Twisted Pair
• Coaxial Cable
• Optic Fibre Cable
WIRED NETWORKING
TECHNOLOGY media are
classified based on the kind of
materials used as :
1. Ethernet Twisted Pair
2. Coaxial Cable
3. Optic Fibre Cable
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17. Wireless or unguided media
means that there is no
physical path for the signal
to move. Hence
communication or
transmission is wireless. For
example :-
1. Bluetooth
2. Infrared
3. Wi-Fi
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18. WI-FI is a populartechnologythat allows
an electronic device to exchange data
wirelesslyovera computernetwork. Wi-Fi
is an abbreviationfor wireless fidelity
known as 802.11 wirelessnetwork.
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20. Operating System is a set of program
that manages all computers
components and operations.
For example:
 MAC OS
LINUX
UNIX
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21. A word processor is a type
of software application used
for
composing,edeting,formatin
g and printing documents.
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22. Giving of information to
some one especially as
part of a formal
ceremony.
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