1. Disadvantage
1.1. i. Anti-social : user spend too much time for the computers
1.2. ii. Health risk : improper used of computers can lead to health injuries such as eye strain
1.3. iii. Public safety : exposed to be the victim of crime due to sharing of photos, videos and personal information
2. Application of Information Technology
2.1. Education
2.1.1. Learning Management System : students can get their lecture notes, answer quizzes and submit assignment by using online
2.2. Finance
2.2.1. Online Banking : allow user to pay bills, track personal income and expenses by using online
2.3. Government
2.3.1. HRMIS : online system for updating government employee information
2.4. Heatlh care
2.4.1. Counter Registration System : hospitals and doctor can use computer or mobile device to maintain and access patient record
2.5. Science
2.5.1. Virtual Reality : to stimulate a real and imagined environment that appears as 3D space
2.6. Publishing
2.6.1. Online newspaper and magazine : allow user to get information easily by using online
2.7. Travel
2.7.1. GPS : allow user to track routes for specific location
2.8. Manufacturing
2.8.1. CAD : use of computer system to increase designer productivity and design equally
3. Categories of computers
3.1. Supercomputer
3.1.1. physical size
3.1.1.1. occupy a full room of equipment
3.1.2. speed
3.1.2.1. tens of thousands of processor
3.1.3. storage
3.1.3.1. extremely large
3.2. Mainframe
3.2.1. physical size
3.2.1.1. occupy partial room of equipment
3.2.2. speed
3.2.2.1. dozens of processor
3.2.3. storage
3.2.3.1. very large
3.3. Personal computers
3.3.1. physcial size
3.3.1.1. fits on a desk
3.3.2. speed
3.3.2.1. single processor
3.3.3. storage
3.3.3.1. large
3.4. Mobile Computer
3.4.1. physical size
3.4.1.1. fits on your lap
3.5. Mobile Device
3.5.1. physical size
3.5.1.1. fits in the palm of your hand
3.6. Embedded computer
3.6.1. physical size
3.6.1.1. miniature