small computer program designed to damage a computer system upon activation
A computer virus is a
computer program that can copy itself and infect a computer without permission or knowledge of the user. The original virus may modify the copies, or the copies may modify themselves, as occurs in a
metamorphic virus. A virus can only spread from one computer to another when its host is taken to the uninfected computer, for instance by a user sending it over a network or the Internet, or by carrying it on a removable medium such as a
floppy disk,
CD, or
USB drive. Additionally, viruses can spread to other computers by infecting files on a
network file system or a file system that is accessed by another computer. Viruses are sometimes confused with
computer worms and
Trojan horses. A worm can spread itself to other computers without needing to be transferred as part of a host, and a Trojan horse is a file that appears harmless until executed.
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