What is a computer Virus?

A computer virus is a program that can ‘infect’ other legitimate programs by modifying them to include a possibly ‘evolved’ copy of itself. Viruses can spread themselves, without the knowledge or permission of the users, to potentially large numbers of programs on many machines. A computer virus passes from computer to computer like a biological virus passes from person to person.

Viruses can also contain instructions that cause damage or annoyance; the combination of possibly damaging code with the ability to spread is what makes viruses a considerable concern.

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