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Well, a virus is a program that does things without the user's knowledge or consent. Some viruses (the Welchia worm, for instance) tried to be "good" and patch Windows PCs to prevent infection from other viruses. While the virus had good intentions, it did so without the user's permission and crashed hundreds of PCs due to wasteful bandwidth use (normally, in companies, an efficient method to distribute updates internally is used. Welchia didn't use it and clogged the internet connections of many businesses).

Now, a worm is a virus that can replicate on it's own. A full fledged worm, like the sasser worm, can infect on it's own without the user making a mistake (vulnerability found, exploited, worm installed, spread to other pcs- and you didn't have to do anything). Most worms rely on email though- you open the wrong email or attachment, you get infected, and your computer spams out the worm to others, making it self propogating.

A Trojan is a virus that makes you download it manually by impersonating a desirable program (you need to download this to watch a video, free pornographic material, free antivirus, etc). It doesn't spread on it's own but causes undesirable behavior when installed.

Hope this helps!

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Q: What are the key distinguishing characteristics of worms viruses and Trojan horses?
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Do Trojan horses carry viruses or worms?

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