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What is a computer virus?

What is a computer virus? Here are some definitions.

Noun
  1. (computing) A program which can covertly transmit itself between computers via networks (especially the Internet) or removable storage such as disks and USB drives, often causing damage to systems and data.
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According to media reports, the 2003 Pan American Games have been disrupted by a computer virus.
How do you stop a computer virus from spreading and infecting other computers?
The internet rumour mill has been working overtime, a game of bluff and counter-bluff spreading like a computer virus.
They were unprepared for operations being interrupted by a system crash or the arrival of a computer virus through email.
Almost one in every three Internet users in the United States has been hit by either a computer virus or a hacker in the past two years.
Anyone who has been hit by a computer virus will be doubly wary of unexpected emails in the future that may contain viruses.

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