The computer virus is simply a set of computer instruction or code
A computer virus is different from the virus which belongs to the league of bacteria and diseases.
A Computer virus is basically a malicious code which replicates itself in the system by copying itself to another program or document. After this, it changes how a computer works.
A Computer virus are usually loaded onto a user's computer without the user's knowledge.
A Computer virus performs not other function than to maliciously infected the users computer.
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