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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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Examples
A computer virus which affected the operation of Google yesterday is spreading like wildfire.
Opening a file could expose your system to a computer virus or a program that could hijack your modem.
Anyone who has been hit by a computer virus will be doubly wary of unexpected emails in the future that may contain viruses.
According to media reports, the 2003 Pan American Games have been disrupted by a computer virus.
Hewlett-Packard has distributed printer drivers corrupted by a computer virus.
Global chaos ensues when a computer geek, fired from his job, unleashes an unstoppable computer virus.

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