Input and Output devices.

The main function of a computer is to manipulate and to store information. Input devices are used to load information into the memory of the computer or just to control it. There are lots of input devices. Three main input devices that every PC has are mouse, keyboard and a floppy disk. Additionally you can also connect a scanner , a touchpad , a joystick to play computer games, digitizing tablets, smart cards readers ,a CD-ROM , a microphone and others.

To show the user the result of an operation computer uses output devices. The main output device is a monitor. If you want computer to draw an image you should have a printer. Sound output goes through speakers.