Input and Output devices with example[2020]

In this tutorial we are going to learn about different input and output devices that can be used in computer.


An input device sends information to a computing system for processing, and an output device reproduces or displays the results of that processing. Input devices only leave input of data to a computer and output devices only receive the output of data from another device.

Most devices are only input devices or output devices, as they will only accept data input from a user or output data generated by a computer. However, some devices can accept input and display output, and that they are mentioned as I/O devices (input/output devices).

Input Device

input device is a device through which data and instruction are entered into a computer system. It convert these instruction and data into binary code that is recognised by the computer. The keyboard, light pen, scanner, touch screen, and mouse are some of the popular input devices. Some other example of input devices are as follows:

Graphics Tablets

graphics tablet

A graphics tablet (also referred to as a digitizer, drawing tablet, drawing pad, digital drawing tablet, pen tablet, or digital art board) may be a computer data input device that permits a user to hand-draw images, animations and graphics, with a special pen-like stylus, almost like the way an individual draws images with a pencil and paper.

 Digital camera

is an data input device that takes pictures digitally. Images are stored as data on memory cards. It has an LCD screen that permits users to preview and review images.



a trackball is a pointing input device. It consists of a ball held by a socket containing sensors to detect a rotation of the ball about two axes. It is like an upside-down mouse with a ball that stands proud . The user rolls the ball with the thumb, fingers or the palm of the hand to manoeuvre a cursor.

 Barcode reader

barcode reader

A barcode reader (or barcode scanner) is an optical scanner which will read printed barcodes, decode the info contained within the barcode and send the info to a computer.



A gamepad, joypad, controller, may be a sort of game controller held in two hands, where the fingers (especially thumbs) are wont to provide input. They are typically the most data input device for computer game consoles.



A joystick is an data input device consisting of a stick that pivots on a base and reports its angle or direction to the device it’s controlling.


one among the first input devices wont to input file and commands. It has function keys, control keys, arrow keys, keypad and therefore the keyboard itself with the letters, numbers and commands


 an data input device that permits users to input audio into their computers.


 an data input device wont to control the cursor and coordinates. It can be wired or wireless.


 is an data input device that reads a picture and converts it into a digital file.


is an data input device connected to the pc and therefore the internet that captures still picture or motion video.



Optical mark recognition (also called optical mark reading and OMR) is that the process of capturing human-marked data from document forms like surveys and tests. They are wont to read questionnaires, multiple choice test paper within the sort of lines or shaded areas.


Optical Character Reader

Optical character recognition or optical character reader (OCR) is that the electronic or mechanical conversion of images of typed, handwritten or printed text into machine-encoded text

Biometric devices

is an data input device wont to input biometric data into a computer.

MICR (Magnetic Ink character reader)


MICR (magnetic ink character recognition) is a technology used to verify the legitimacy or originality of paper documents, especially checks.

Output device

The device that accepts the data from the CPU and presents it to the user in a form acceptable to the user is called output device. It converts the binary codded data into human readable form. The monitor, printer and speaker are some of the popular output devices. Some other example or output devices are given below:

Monitor (LED, LCD, CRT etc)

This is the most common computer output device. It creates a visible display by the utilization of which users can view processed data. Monitors come in various sizes and resolutions.

Printers (all types)

this device generates a hard copy version of processed data, like documents and photographs. The computer transmits the image data to the printer, which then physically recreates the image, typically on paper.



this generates a hard copy of a digitally depicted design. The design is shipped to the plotter through a graphics card, and therefore the design is made by employing a pen. It is generally used with engineering applications, and essentially draws a given image employing a series of straight lines.


this is a display device that projects a computer-created image onto another surface: usually some sort of whiteboard or wall.


speakers are attached to computers to facilitate the output of sound; sound cards are required in the computer for speakers to function.

Input/output device

Those devices which take input as well as produce output in user understandable form are known as input/output devices. Some of the example of input/output devices are given below:

  • CD-R/RW, DVD, and Blu-ray drive
  • Digital camera
  • Floppy diskette drive
  • Hard drives
  • Modem
  • Network adapter
  • SD Card
  • Touch screen

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