computer
by vasu veeravasu

1. hardware
1.1. input
1.1.1. keyboard
1.1.2. mouse
1.1.3. microphone
1.1.4. scanner
1.1.5. pointer
1.1.6. joystick
1.2. output
1.2.1. moniter
1.2.2. speaker
1.2.3. printer
1.2.4. projecter
2. software
2.1. program
2.1.1. browser
2.1.2. game
2.1.3. doccument
2.2. OS
2.2.1. window
2.2.2. mac OS
2.2.3. Linux