1. supercomputer
2. computer software
2.1. System Software
2.1.1. OS (Operating System)
2.1.1.1. DOS (Disk operating System)
2.1.1.2. UNIX
2.1.1.3. LAN
2.1.1.4. Windows NT
2.1.1.5. OS/2
2.1.2. Translation Program
2.1.2.1. Assembler
2.1.2.2. Interpreter
2.1.2.3. Compiler
2.1.3. Utility Program
2.1.4. Diagnostic Program
2.1.4.1. QAPLUS
2.1.4.2. NORTON
2.2. Application Software
2.2.1. User Program
2.2.1.1. BSDIC
2.2.1.2. COBOL
2.2.1.3. PSDCSL
2.2.1.4. C
2.2.1.5. ASSEMBLY FORTRAN
2.2.2. Package Program
2.2.2.1. Word Processor
2.2.2.2. Spreadsheet
2.2.2.3. Database
2.2.2.4. Graphic
2.2.2.5. Game
2.2.2.6. Creating a scenario
2.2.2.7. Communications
2.2.2.8. teach
3. Computer type
3.1. mainframe computer
3.2. minicomputer
3.3. microcomputer
3.4. notebook or laptop
3.5. Ultrabook
3.6. tablet computer
4. computer hardware
4.1. Input Unit
4.1.1. Key board
4.1.1.1. Built in keyboard
4.1.1.2. Ergonomic keyboard
4.1.1.3. Cordless keyboard
4.1.1.4. Portable keyboard
4.1.1.5. Virtual keyboard
4.1.2. Mouse
4.1.2.1. Mechanical mouse
4.1.2.2. Optical mouse
4.1.2.3. Optical mouse
4.1.3. OCR (Optical Character Reader)
4.1.4. OMR (Optical Mark Reader)
4.1.5. MICR (Magnetic Ink Character Reader)
4.1.6. Digitizer
4.1.7. Scanner
4.1.8. Light Pen
4.1.9. Joy Sticks
4.1.10. Touch Screen
4.1.11. Point of Sale Terminal
4.1.12. Touch Pads
4.1.13. Digital Camera
4.1.14. Voice Input Devices
4.2. Central Processing Unit
4.2.1. Control Unit
4.2.2. Arithmetic and Logical Unit
4.3. Collect data Unit
4.3.1. Main Memory
4.3.1.1. RAM: Random Access Memory
4.3.1.2. ROM: Read Only Memory
4.3.1.3. CMOS : Complementary Metal-oxide Semiconductor
4.3.2. Secondary Storage
4.3.2.1. Hard Disk
4.3.2.2. Floppy Disk
4.3.2.3. Compact Disk
4.3.2.4. Flash Drive or Flash Memory
4.3.2.4.1. SD Card
4.3.2.4.2. PC card
4.4. Output Unit
4.4.1. Soft Copy
4.4.1.1. Monitor
4.4.1.1.1. Cathode Ray Tube
4.4.1.1.2. Liquid Crystal Display
4.4.1.2. Projector
4.4.1.2.1. Liquid Crystal Display
4.4.1.2.2. Digital Light Processing
4.4.1.3. Audio Output
4.4.1.3.1. Speaker
4.4.1.3.2. Sound card
4.4.2. Hard Copy
4.4.2.1. Printer
4.4.2.1.1. Impact printer
4.4.2.1.2. Non impact printer
4.4.2.2. Plotter