1. Disadvantages
1.1. can lead to health problems
1.2. can cause pollution
1.3. many employee might jobless
2. Application of IT
2.1. Education
2.1.1. Learning Management System
2.1.2. Computer Based Training
2.2. Finance
2.2.1. Finance Investment System
2.2.2. Online banking system
2.3. Government
2.3.1. E-filing
2.3.2. E-Syariah
2.4. Health care
2.4.1. Medline
2.4.2. Counter Registration System
2.4.3. Telemedicine
2.4.4. Telesurgery
2.5. Science
2.5.1. Virtual reality
2.5.2. Cochlear implant
2.5.3. Hawk Eye Officiating System
2.6. Publishing
2.6.1. Online Newspaper
2.6.2. Online Magazine
2.7. Travel
2.7.1. GPS
2.7.2. E-ticketing
2.7.3. Online Reservation System
2.8. Manufacturing
2.8.1. Computer-Aided Design
2.8.2. Computer Aided Manufacturing
3. Categories of Computers
3.1. Supercomputer
3.1.1. Fastest and most powerful computer.Can process more than one quadrillion instructions
3.1.2. occupy a full room of equipment
3.2. Mainframe
3.2.1. Powerful computer that can handle hundreds or thousands user simultaneously
3.2.2. occupy partial room to a full room of equipment
3.3. Personal computer
3.3.1. computer that can perform all its input,processing,output and storage
3.3.2. fits on a desk
3.4. Mobile computer
3.4.1. can carry from place to place
3.4.2. fits on lap
3.5. Mobile devices
3.5.1. computing device small enough to hold in your hand or fits in your palm
3.6. Embedded Computers
3.6.1. special purpose computer act as a component in a larger product
3.6.2. miniature