computer

1. software

1.1. program

1.1.1. browser

1.1.2. game

1.1.3. doccument

1.2. OS

1.2.1. window

1.2.2. mac OS

1.2.3. Linux

2. hardware

2.1. input

2.1.1. keyboard

2.1.2. mouse

2.1.3. microphone

2.1.4. scanner

2.1.5. pointer

2.1.6. joystick

2.2. output

2.2.1. moniter

2.2.2. speaker

2.2.3. printer

2.2.4. projecter