SOLUTION

I/O Device (Peripherals) The device that gives information to the computer is called an input device. For example, keyboard, mouse, joystick, microphone, A/D converters are all input devices. The device that receives information from the computer is called an output device. For example, LED, LCD, monitor, printer, speaker, D/A converter are output devices.

In addition to input devices and output devices, some devices function as both input and output devices. The I/O devices provide the input to the computer as well as get output from the computer. The I/O devices are used by both the input unit and the output unit. Hard disk drives, floppy disk drives, optical disk drives are examples of I/O devices. 

Memory such as Floppy drive, CD-RW (reader/writer) is input as well as output devices.