Previously we have looked at both output and input devices.

However, some devices act as both input and output devices, allowing them to perform both input and output function 

We'll look at only five of these devices in this post.

An input-output device is any device that allows you to send and receive data to and from a computer.

Network cards, modems, facsimiles, headsets, and sound cards are examples of devices that can serve as both input and output devices.

Network card

This is a hardware device used for networking.

A network interface card (NIC) is a hardware component that allows a computer to connect to a network.

Without it, a computer may not be able to connect to a network.

A network card is also defined as a circuit board located near the USB drive that serves as a path of connection between the user and the computer.

This path is effective for both sending and receiving data from the computer. 

As a result, the network interface card (NIC) is both an input and output (I/O) device.


This has both activities of scanning (Input device) as well as printing (output device). 

It functions as a scanner (input device) on the sender's end, scanning photos, and letters on paper, and converting them to a digitized format before sending them over the phone line to the other end. 

A facsimile (or fax machine) also serves as a printer at the receiving end, printing the digitalized data on paper using special wax paper.


Headphones, as previously stated, are audio output devices that enable you to listen to sound from your computer or other sources.

A headphone with a microphone is called a headset.

Headset is an input and output device

A headset is made up of a speaker that serves as an output device by allowing you to hear sound from your computer, and a microphone that serves as an input device by allowing you to speak into the computer.



Modem stands for modulator/demodulator.

Modulation is the process of applying functions to a signal to make it capable of being transmitted; This is output.

Demodulation is the inverse of modulation, hence its role is to receive the modulated signal and demodulate it. This can be thought of as the input.

The output of the modem is this: The Modem converts a digital signal into an analogue signal for transmission across analogue media such as cable or telephone lines when transferring communications out of the network (modulation)

The input of the modem is thus: the modem converts the analogue signal to a digital signal for transmission on the local network when signals from the internet enter the modem.

Sound card

A sound card, often known as an audio card, is an internal expansion card that allows computer programs to control the input and output of audio signals to and from the computer. 

The sound card can either convert analogue sound from a microphone (or an audio cassette) to digital data that can be saved in an audio file or accept digitized audio signals from an audio file and convert them to analogue signals that can be played on the computer's speakers.

Sounds cards essentially serve as an input and output device for audio.

When you listen to sound through a speaker, you are essentially using the output capabilities of sound cards.

When you speak into a microphone, you are essentially using the input capabilities of sound cards.

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