Why Technical English

A worm, a virus or a Trojan horse? | June 5, 2009

We study English discussing actual technical problems

By Pavel Macenauer

Many people often misuse these terms, which may in reality lead to great confusions while discussing this topic. Discrimination the differences between them might help you protect your computer.

What is a virus?

A virus is a malicious program usually hidden in an executable file. It is able to replicate and cause harm only as a consequence of a human action. For example, you´ve just received a suspicious email offering you to earn lots of money simply by filling out a form contained in an executable file. When you open this file, you basically run the virus. It has not only a harmful effect on you computer, but it also adds a copy of itself to every email you send.

What is a worm?

Worms are not very much different from viruses. Some people even consider them to be a subspecies of a virus. Worms take advantage of every piece of contact information in your computer and without any human action they replicate and then cause harm. Usually, they abuse contact information hidden in your email client or your instant messenger.

What is a Trojan horse?

At a first glance, Trojan horses appear as helpful software. Usually, they even mask as virus removal tools. In reality they are designed only to cause harm. The main difference between a horse and a virus or between a horse and a worm is that horses can’t replicate. They are mostly used for tunneling information or for enabling a third party to access your computer.

Many people often misuse these terms, which may in reality lead to great confusions while discussing this topic. Discrimination the differences between them might help you protect your computer.

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6 Comments »

  1. It is exactly my case. I haven´t seen any difference between a virus and a warm. Thank you, Pavel, for your explanation.
    G. Vitkova

    Comment by gvitkova — June 10, 2009 @ 9:55 pm

  2. Velice zajímavá informace. Většinou jsem se stěmito termíny setkával, ale odlišnosti jednotlivých typů virů jsem nevěděl. Takže děkuji. Vítek

    Comment by Vitold Vítek — June 10, 2009 @ 10:05 pm

  3. The technology helps protects against new spyware, viruses and worm threats before they are even created. Kailee Address

    Comment by Kailee Address — June 18, 2009 @ 11:24 am

  4. Hi Everybody 🙂

    I just wanted to comment on the contribution of this community here. It’s amazing.

    I wanted to give a little something back myself

    There is a site that has been extremely helpful to myself and some associates of mine. That site is OnlineComputerHelpers.com and they offer remote computer repair

    I hope that my contribution has been substantial and you also are able to use their services just as I have.

    Comment by Zedsfrepled — June 27, 2009 @ 12:52 am

    • Thank you very much for offering servises interesting for people around the blog. I believe that some of them could need these servises. To your succsess.

      Comment by Galina Vitkova — June 28, 2009 @ 9:29 am

  5. […] A worm, a virus or a Trojan horse? […]

    Pingback by Changing the theme of this blog « Why Technical English — August 26, 2010 @ 9:26 am


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