- A computer program or programming code which replicates by seeking out other programs onto which to copy itself. It usually passes from computer to computer through the sharing of infected files, and goes unnoticed until it attacks, unless an antivirus program that recognizes the virus detects it first. The effects of a virus may be as slight as a friendly message appearing once on a screen, it might cause a system crash, or it may reach the extreme of destroying a hard drive. Also called virus program, or computer virus.
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