Introduction to the Information Technology
by Nor Hasnah Hasan
1. Definition
1.1. The use of computer hardware and software to store, retrieve and manipulate information.
2. Advantages
2.1. Speed
2.1.1. Reliability
2.1.1.1. Consistency
2.1.1.1.1. Storage
3. Disadvantages
3.1. Health Risks
3.1.1. Violation of Privacy
3.1.1.1. Public Safety
3.1.1.1.1. Impact on Labour Force
4. Application of Information Technology
4.1. Education
4.1.1. Finance
4.1.1.1. Government
4.1.1.1.1. Health Care
5. Type of Computer
5.1. Supercomputer
5.1.1. Mainframes
5.1.1.1. Personal Computer
5.1.1.1.1. Mobile Computer
6. Physical Size
6.1. Size of supercomputer occupy a full room of equipment
6.1.1. Size of mainframe occupy partial room to a full room of equipment
6.1.1.1. The size of personal computer fits on desk
6.1.1.1.1. The size of mobile computer fits on your laps or in your hand
7. Storage
7.1. Supercomputer have extremely large storage
7.1.1. Mainframes have a very large and addable storage
7.1.1.1. Personal computer also have large kind of storage
8. Speed
8.1. Supercomputer can process ten thousands of processor
8.1.1. Mainframes can process dozens of processors
8.1.1.1. Personal computer only can have a single processor (1.5-2.5 Ghz)