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A computer virus is a program that spreads by first infecting files or the system areas of a computer or network router's hard drive and then making copies of itself. Some viruses are harmless, others may damage data files, and some may destroy files.
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Computer viruses from en.wikipedia.org
A computer virus is a type of malware that, when executed, replicates itself by modifying other computer programs and inserting its own code into those programs ...
A computer virus is a type of malicious software, or malware, that spreads between computers and causes damage to data and software.
A computer virus is a malicious application or code used to perform destructive activity. Learn exactly what it is, how it works, examples, and more.

Computer virus

A computer virus is a type of malware that, when executed, replicates itself by modifying other computer programs and inserting its own code into those programs. If this replication succeeds, the affected areas are then said to be "infected" with... Wikipedia
Computer viruses from us.norton.com
A computer virus is a malicious code or program designed to spread from one computer to another, causing damage to data and system operations.
A computer virus is a type of malware that attaches to another program and can replicate and spread to other computers. Think you have a computer virus?
Computer viruses from www.mcafee.com
A computer virus is an illegal, harmful, or malicious program that can change the way your computer runs and behaves.
A computer virus is a malicious piece of computer code designed to spread from device to device. A subset of malware, these self-copying threats are usually ...
Learn how to protect your Windows devices and personal data from viruses, malware, or malicious attacks.
A computer virus is a program designed to spread itself by first infecting files or hard drives and then making copies of itself.