Computer

1. Computer software

1.1. System software

1.1.1. Operating systems

1.1.1.1. Mobile OS

1.1.1.1.1. Google Android

1.1.1.1.2. Windows Mobile

1.1.1.2. Windows 2000

1.1.1.3. Unix

1.1.1.3.1. Linux

1.1.1.3.2. Mac OS

1.1.2. Reboot

1.2. Application software

1.2.1. Spreadsheets programs

1.2.2. Word processing

2. Computer network

2.1. Firewall

3. Computer hardware

3.1. Motherboard

3.1.1. Computer brain

3.1.1.1. Main Memory

3.1.1.1.1. CPU

3.1.2. Expandable card

3.1.2.1. Blue Ray Drive

3.1.2.1.1. Blue Ray Discs

3.1.2.2. DVD Drive

3.1.2.2.1. DVD

3.1.2.2.2. Optical storage

3.1.2.3. Graphic card

3.1.2.4. Hard drive

3.1.2.5. Network card

3.1.2.6. Sound card

3.1.3. Peripherals

3.1.3.1. Devices

3.1.3.1.1. Input

3.1.3.1.2. Output

3.1.3.1.3. Input / Output

4. Computer programming

4.1. Byte

4.1.1. Gigabyte

4.2. System clock