Computer Hardware

1. Networks

1.1. WAN

1.2. LAN

1.3. Internet

2. Hardware components

2.1. System units

2.1.1. CPU

2.1.2. Primary memory

2.1.3. Expansion ports

3. Peripheral device

3.1. Secondary storage unit

3.1.1. Magnetic

3.1.2. Solid state

3.1.3. Optical

3.2. Input devices

3.3. Output devices

4. Computer systems

4.1. Supercomputer

4.2. Mainframe

4.3. Personal

5. Computer platforms