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Computer input and output devices: An input/output device, often referred to as an IO device, is any piece of hardware that allows a human operator or other systems to interact with a computer. Input and output devices are important components of a computer. These allow the system to function properly in the absence of outside help. The input allows the user to provide data, while the output completes the data-bound operation. They are all auxiliary devices that connect to the device and perform all necessary functions.

Computer input devices

Input devices allow users to send signals to the computer to perform a certain task. The Central Processing Unit (CPU) then receives the signal and passes it to the output devices. Input devices are further classified, such as visual or auditory, discrete or continuous, direct or indirect. Some examples of input devices are:


The most commonly used type of input device is a keyboard. They connect to the computer via wifi or a USB system. There are keys for everything: numbers, letters, characters and functions. The typing keys are AZ and the number keys up to 09. There are different varieties of keyboards, but the most common is QWERTY.


A mouse is a portable input device that allows users to move the cursor around the screen. It operates on a flat surface, with a wheel positioned between the left and right buttons. Laptops have a touchpad, which serves the same purpose as the mouse Douglas C. Engelbart was the first to invent the mouse in 1063.

Optical scanners

Optical scanners can read marks made with a pen or pencil. It is frequently used by educational institutions to review objective tests.

Barcode reader

It is a reading device used to read barcode information on products, books, etc. Fixed and portable scanners digitize the image by converting it into an alphanumeric value on the computer.


It has an integrated voice input system, which receives sound signals and converts them into digital form. It is a commonly used device in music-related applications and multimedia presentations.

To scan

A scanner is an input device that transfers information from paper to a computer, much like a photocopy does. This is mainly used to modify data by converting an image into digital format and then printing it.

luminous pen

Light Pen is a pen-like pointing device that allows users to select and even draw on the screen. The compact tube has built-in photocells and optical components that allow signal flow to the CPU. When the button is pressed, the pen tip moves across the screen and the processor receives the signals.


A joystick is also a pointing device used to move the cursor on a display screen. However, it is not the same as a mouse, to move the cursor. It has a ball and stick configuration in the shape of a sphere. It is a computer tool made mainly for gaming that can move in all directions.

Magnetic Ink Card Reader (MICR)

The MICR is a device found in banks because banks have to process a large number of checks every day. The magnetic ink of the bank code number and the check number allows the machines to read the letters. Magnetic ink character recognition technique is used in this procedure. It’s fast and there are fewer errors.

Optical Character Reader (OCR)

It is a reading device that scans printed text character by character to read it. Before storing them in system memory, it first transforms them into machine-readable code.

Computer output devices

After the input device has processed the data, the output devices are responsible for showing result. It can take the form of an image, graphic, text or audio file. These devices display the visual elements on the screen. Examples of output devices are:


Printers are output devices that allow the user to print data or information on paper. Impact printers, character printers, line printers, laser printers, etc. are different types of printers.


The speaker is a sound-producing output device that responds to commands from the computer by emitting sound. Computers as well as other hardware devices are also supported by them. Bluetooth-enabled wireless speakers are now also available.


This optical device displays both still and moving images on the screen. They are found in auditoriums, movie theaters, etc. It establishes a connection with the computer and extends the viewing area of ​​the image.


The most important output device for providing the user with a pixel-based visual is the visual display unit. Monitors are also known as Visual Display Units (VDUs). It produces images by arranging small dots, called pixels. The sharpness of the image is determined by these pixels.

Video card

This component fits into sockets on a computer system’s motherboard. It improvises the appearance of digital content on other output devices. This becomes essential now because nowadays many people have multiple devices for personal use.


Another name for headphones is headsets. The only difference between a headset and a speaker is the frequency of the sound. This device has a lower sound frequency and is also difficult to hear in large areas such as lawns and parks. Only the person using them can hear the sound.

computer input and output devices

Some devices have features that make them suitable such as input and output devices. They have the ability to receive and transmit data, becoming useful for both purposes.

  • Helmet : It has an input device (the microphone) and an output device (the speaker).
  • Modem: These devices are responsible for using telephone connections to transport data from one device to another.
  • Facsimile: This type of fax machine has a printer as the output device and a scanner as the input device.
  • USB key: It is a removable storage medium that can transfer data between devices and receive data from any computer.
  • CD players: It stores computer information in the specified format and can also transfer information to other devices with disk space.

What is the difference between input and output devices?

Input devices exit devices
Data is accepted from the user Displays the data to the user after processing.
Receives user data and sends it to the processor for processing or storage in secondary memory. Receives information from the processor and returns it to the user
More complex design Minus cintricate design
Used to accept data Used for the purpose of displaying or showing data
Example: scanner, keyboard, etc. Example: monitor, speaker, etc.

Computer Input and Output Devices: Sample Questions

Q.1 Which of the following is a direct input input device?

  1. optical scanner
  2. Mouse
  3. light pen
  4. all these


Q.2 Dot-matrix is ​​a what type of device?

  1. Printer
  2. To scan
  3. Monitor
  4. Keyboard


Q.3 Which device is used to capture x – y coordinates?

  1. card reader
  2. Controller
  3. Keyboard
  4. All these


Q.4 Which of the following is required when multiple people are using a central computer at the same time?

  1. Terminal
  2. luminous pen
  3. Digitizer
  4. Mouse


Q.5 What provides the link between the CPU and the users?

  1. Peripheral devices
  2. Storage
  3. Control unit
  4. Software


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Computer input and output devices: functions and questions with example_60.1

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