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Definition Information Technology
The use of computer hardware and software to store,retrieve and manipulate Information.

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Advantage
-many computers process billions or trillions of operations in a single second .
-the electronic components in computers are dependable and reliable because they rarely break or fail.
-same input will produce same result
-store enormous amount of data and able to process anytime it is needed.

Disadvantage
-personal and confidential records stored on computers were not protected
-computer replaced many labours
-lead to health injuries
-computer waste are destroying natural resources and polluting the environment.

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APPLICATION OF INFORMATION TECHNOLOGY

1)education- learning management system(LMS)
2)finance- online banking
3)government-HRMIS
4)health care -telemedicine
5)science-virtual reality (VR)
6)publishing-online newspapers
7)travel-global positioning system(GPS)
8)manufacturing-computer-aided manufacturing (CAM)
9)retail -shoppe
10)entertainment-Netflix

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CATEGORIES OF COMPUTER

SUPERCOMPUTER

physical sizes-Size of supercomputer occupy a full room of equipment.

Speed-Tens of thousands of processors.

Storage -extremely large storage

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MAINFRAME

Physical sizes -sizes of mainframe occupy partial room to a full room of equipment.

Speed- dozens of processors

Storage- very large and addable storage

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PERSONAL COMPUTER

Physical sizes- the size of personal computer fits on desk

Speed -single processor

Storage - large