Computer Introduction

By  Stephen Harrison  B.Sc., M.Sc., MBCS, CITP

OK. Let's start with a computer introduction. Everywhere you look, there is a computer of some description working to perform a task or action. Some are obvious, such as a laptop. Other, less so, such as a car or a thermostat.

To the benefit, or detriment, of society (depending on your view), computing technology is here to stay, and it is evolving all the time, at an unprecedented rate.

This means if you do not have experience or interest in using computing hardware and software, you are putting yourself at an increasing disadvantage, whether it be at home, work or part of daily life.

I've heard people who fear or reject technology in all its forms be unkindly referred to as Luddites in the IT industry.

In the early 18th century, textile workers in northern England, called the Luddites, actively destroyed advanced industrial machines and equipment they saw as a threat to their livelihood.

They thought machines would reduce the need for their skills, thus lowering their wages and eventually replacing them completely, leaving them out of work.

Don't be a Luddite! Even if you don't class yourself as 'technically minded', there are reasons why they play an important part in society, and therefore why you should understand the basics at least! That is what this computer introduction page is all about.


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The chances are you know about some form of computer, whether you are aware of it or not. The majority of people know how to use a computer of some description (its functionality). 

As part of your computer introduction we look at what computers are, what they do and the different types. We touch on the different hardware devices we use today and the types of software available to operate that hardware.

However, first things, first in this computer introduction. What are computers?




About Computers

A proper computer introduction requires us to get a little technical. Not too technical, though, but just enough so the principles of computing technology are understood.

Computers are machines. They are electronic devices. The hardware undertakes tasks by performing instructions written in a software program to achieve a desired result or output.

The hardware is items such as a keyboard, monitor or hard drive. Software is the instructions that tells the hardware what to do.

Computers have 4 main functions.

  • Input(s)
    Accepts data/information entered by keyboard or via another connected system/program
  • Processing
    Manipulates the data received as per the instructions provided by the software
  • Output(s)
    The desired outcome, either displayed on screen or as a performed action
  • Storage
    Where the data output is stored or hosted

Well, what does all that mean exactly, you may ask? It means everything you do on a computer follows the above steps. Let's take typing up a document as an example.

  1. You type the words on your keyboard (Inputs)
  2. The word-processing software manipulates your keystrokes from a collection of zero's and one's (machine code) in to something that makes sense to you, i.e. your letters and words (Processing)
  3. Your letters and words appear on your monitor (Outputs)
  4. You save your letter to your hard drive, then e-mail or print (Storage)

As you can appreciate, personal computers perform these actions very, quickly. 


Desktop Computer FunctionsComputer Introduction
A Labelled Personal Desktop Computer Showing:
Inputs: Keyboard, Mouse
Processing/Storage: Base Unit
Outputs: Monitor

The principles of what a computer is, can be applied to all forms of machine. In the next section, we look at the different types of computer we have at our disposal today.

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Computer Hardware

As part of your computer introduction, it is important to understand the different types of machine in existence today, and what their role is.

Machines range in size and capability, from huge supercomputers such as the Tianhe-2, to standard desktops, smartphones and embedded devices found in fire alarms.

To put supercomputers into perspective, Tianhe-2 (or TH-2), has 3,120,000 processing cores, 1,024 000 GB RAM and costs US$390 million to build.

A standard desktop computer has 4 processing cores, an average 4 GB RAM (memory) and cost around £450 to purchase!


Tianhe-2 SupercomputerComputer Introduction
Tianhe-2 Supercomputer

Everyday personal computers come in the form of desktops (pictured above) and laptops. Microsoft Windows-based devices are the most common at the time of writing. Hardware is manufactured by a variety of companies.

Devices such as the MacBook Pro Laptop is manufactured by Apple, who also provides the operating system (OS X). Laptops are more transportable than desktops due to their size and weight.

Other portable computers such as tablets and smartphones are increasingly popular today. Although limited in what they can do when compared to desktops, they provide a convenient way to communicate online with each other.

Hardware such as these are used in the home, education and in business. A whole variety of tasks are undertaken on these machines, such as document writing, e-mails, web surfing, instant messaging, presentations and accounting tasks to name but a few.

Hardware such as smart TV's (and remote controls), thermostats, air conditioning units, microwave ovens and medical equipment have what is known as embedded devices.

These are small chips that sit directly on the device's motherboard. They are programmed to perform a single task.

A fire panel, for example, is programmed to send a real-time alert to an audible alarm if it receives data from a heat sensor that surpasses a set temperature threshold, i.e. a potential fire.

Another example is the functioning of the electronic dashboards in trains and cars.


Train With Embedded Device DepictedComputer Introduction
Electronic Dashboard Embedded Device
Courtesy of blog.waayoo.com

Each type of hardware device discussed here is made up or comprised of various components. Hard disk drives, memory and processors form part of internal components that make up a personal computer (PC).

Monitors, printers and mice form part of the external hardware components of a PC. We look at these, in more detail, in the Computer Hardware Components article.

For hardware to work as we see today, software programs are required. Just like hardware, software programs are designed to meet a variety of objectives and tasks, ranging from firmware to modern applications. We take a look at this in the next section. 

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Computer Software

A computer introduction wouldn't be right if it overlooked software. This is the real engine of computing technology, without which hardware would be a complete waste of time, as it would not be able to do a thing!

OK. Let's start with firmware. This is a software program that sits on computer chips and enables the hardware to communicate with other types of software, such as the operating system.

Known as UEFI or BIOS in PCs, it checks all the parts inside your machine e.g. keyboard, ports, memory, graphics card etc., are in working order before your operating system loads.

Other types of firmware perform similar functions on hardware components such as sound cards and graphic cards.


Legacy BIOS Setup UtilityComputer Introduction
Legacy BIOS Setup Utility

Operating Systems are a necessity for modern computers to work properly. There is a variety of different makes and versions, depending on the hardware device in use.

PCs use Microsoft Windows. Mac's use OS X. Both are classed as commercial operating systems, which means there is a cost associated with each. You must buy a genuine licence to use. This limits software theft.

Some people use LINUX, which is classed as an open source O/S. This means it is free to use, and you don't need to buy a licence. LINUX comes in various forms, such as Ubuntu or Mandrake.


Linux Ubuntu Operating SystemComputer Introduction
Linux Ubuntu Operating System

Device drivers enable the O/S to interact with hardware components. Each main hardware component requires a loaded device driver program to interact with the O/S.

As with all software forms, device drivers are updated frequently. The benefits of doing this includes bug fixes, improved security and performance.

Applications are a collection of computer programs or routines that enable you to carry out your intended tasks or activities. Whether it is on a desktop PC or an android device, applications are dependent on system software such as the O/S, but are independently run.

There are literally millions of software programs in existence today, all classified in lots of different categories. Some programs are free. Some you pay for. Some enable you to do you home accounts. Some remove malware. The list is endless.

Examples of applications include Word Processing (Microsoft Word), Anti Virus (Avast) and games (for your Xbox or PlayStation - another type of hardware device!).


Microsoft Word 2019 RibbonComputer Introduction
Microsoft Word 2019 Ribbon

With so many things comprising a typical computer, it is no surprise things sometimes stop working. Whether it is hardware or software related, understanding the basic principles of troubleshooting is critical.

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Computer Introduction | Final Thoughts

Writing a computer introduction is more difficult than it sounds. Once you delve in to the detail, it is easy to get caught up with all the technical terms and lose sight of whom the article is aimed at.

Our journey through what computers are, the different hardware and software types, and the troubleshooting framework gives you a decent head start to be your computer support technician.

To round the computer introduction article off, take a moment to watch the video below. It is an excellent, 2-minute video that encapsulates the answer to the question 'what is a computer' perfectly.


Computer Introduction | What is a Computer? Video

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What Is A Computer? Video

The video is part of the excellent, free Computer Basics course. Take a look to learn more.

The Wikiversity Introduction to Computers is an online course with an academic feel to it. However, it is succinct and delivered in an easy-to-understand way.

Next, take a look at the Computer Hardware Components page for a more in-depth look at what is inside a typical personal computer.


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