The Four Functions of a Computer

Updated on April 13, 2018
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Alfred is a long-time teacher and computer enthusiast who works with and troubleshoots a wide range of computing devices.

The four functions of a computer actually explain the core reasons why it was built. They include:

  • Data input
  • Data processing.
  • Information output.
  • Data and information storage.

An illustration of the four functions of a computer
An illustration of the four functions of a computer

For example, the user composes a letter by inputting and editing sets of letters, numbers and symbols using a keyboard. The raw data is then processed and viewed real-time via display hardware.

The user may choose to print the letter onto paper, or better still send it via electronic mail to intended recipients.

The same data and information can be retained digitally in disk drives and other media for future reference.

1. Data Input

Every computer is designed with data input as a first function, an activity which is accomplished via input devices.

Data entry is done manually, automatically or both. Manual input is done via add-on peripherals like the keyboard, mouse and stylus. Input can also be accomplished via vocal dictation applications and body gestures peripherals like Kinect and biometric devices. Elsewhere, data input is also done using secondary storage media and networking interfaces.

Application software used for this purpose will also dictate what data is entered. Word processing software is designed to input basic alphanumerical data, while a photo editing application is used to input and manipulate images.

This data may be entered into a database, spreadsheet or other forms of a computerized work area.

Automated applications and robotics can also be used to intelligently feed data into the computer on station or remotely. As an example, tallying of electoral process can be accomplished remotely and automatically.

Laptop keyboard and touchpad
Laptop keyboard and touchpad

2. Data Processing

Data processing is the core function of a computer. Processing involves manipulation of raw data into before converting it into meaningful information. Usually, data is in raw form, and will thus undergo processing before dissemination for user consumption.

The 'brain' of the computer where data is processed is referred to as the microprocessor. It is also commonly known as the central processing unit (CPU) or accelerated processing unit (APU).

The processing chips in modern personal computing devices continue to evolve and outperform its predecessors. One particular evolution is the merger of microprocessor and graphics processing unit (GPU) into what is now known as accelerated processing unit. The merger allows for the integration of powerful graphics processing abilities inside the traditional arithmetic and logical computations of the processor.

Besides the microprocessor, the dynamic random access memory (DRAM) and static random access memory (SRAM) are integral parts of data processing. Data entered via input devices is stored temporarily in DRAM, then transferred to SRAM from where the microprocessor manipulates it.

An AMD microprocessor, inserted onto a laptop motherboard socket
An AMD microprocessor, inserted onto a laptop motherboard socket

3. Information Output

When raw data has been manipulated by the microprocessor, the outcome is meant to be disseminated for useful purposes. The output is thus referred to as information and is beneficial to the computer user.

Processed data or information can be,

  • viewed as alphanumeric, images and video via a display hardware
  • listened to as audio files by use of a speaker
  • printed as hard copy output onto paper
  • printed as 3D models

TV output on a computer screen
TV output on a computer screen

4. Data and Information Storage

The fourth and equally very important function of a computer is data and information storage. After sleepless nights of video and animation creation and editing, the user wants to have the finished product stored for future dissemination and additional editing.

A computer can store information internally and externally. The hard disk drive (HDD) and/or solid-state disk drive (SSD) are internal storage devices and serve to protect and house all data and information on a computer. In bigger systems, the RAID system is used. Multiple disk drives operate simultaneously to ensure data and information integrity.

External storage is achieved through accessories that attach externally to the computer. They include external drives and optical disks.

Better still data and information can be stored online in cloud solutions for a fee or for a fee if large space is required.

Storage integrity is a crucial phase that can actually determine the worth of a computer system. In any case, what use is a computer without data and information?

Information created in the computer can be stored onto CDs and DVDs
Information created in the computer can be stored onto CDs and DVDs

Questions & Answers

    © 2013 Alfred Amuno


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      • profile image

        Franky 41 hours ago


        Anyone up to answer my question?


        State 5function that a digital computer carry out?

      • profile image

        Pema yangchen 2 weeks ago

        it was really helpful. Tank you

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        saadik 2 weeks ago

        Thank you sir for your help☺☺☺

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        Alfred Amuno 3 weeks ago from Kampala

        Thanks for appreciating and its good to know that results went your way.

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        I love informations 3 weeks ago

        Thanks for the information sir.i got high score on my test

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        Neighbor 6 weeks ago

        I love this, I will cite your work

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        Theman 7 weeks ago

        This is good alfred, SO GOOD!

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        Hassan 2 months ago

        This page help me to learn hardware components.

        Thanks alot

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        HARMONEY 4 months ago

        nice information

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        St 5 months ago

        Thanks for your help

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        thanks it help me to access my assignment 7 months ago

        thanks it help me to access my assignment

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        Sa,ad musa muhammad 10 months ago

        Peace and conflict

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        Ratih Firdi 15 months ago from Indonesia

        thank nice article

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        jael 18 months ago

        good information like it

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        Alfred Amuno 22 months ago from Kampala

        Thanks for appreciating Alvin

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        Alvin 22 months ago

        THANK YOU!! I will cite your work =))

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        faheem 2 years ago


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        Alfred Amuno 2 years ago from Kampala

        Glad that you found the info herein helpful, Hope.

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        esmiralda hope 2 years ago

        OMG that is great cant wait for the test