Malware is malicious
software such as viruses, worms, and Trojan horses .Viruses are pieces of code usually hidden in the operating system of a computer or in an
application program. When a user
executes a program containing a virus, the virus quickly copies itself to an
unprotected program. Can jump from one
computer to another when someone uses a disc, flash drive, or a computer
network with an infected machine. Most
viruses are operating system specific.
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