Acomputer virusismalicious software (malware)that replicates itself by attaching to legitimateprograms or files. Once activated, viruses can:
Corrupt or delete files.
Spread across networks, infecting multiple systems.
Cause performance issuesor even render a system inoperable.
Unlikeworms, which can spread independently, viruses requirehuman action(e.g., opening an infected file or running an executable).
References:McAfee Institute CCII Cyber Threat Guide, Cybercrime Encyclopedia​.
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