A program or programming code that duplicates itself and infects the computer is termed a
Virus. They can be can be transmitted as attachments to an e-mail note or in a downloaded file, or
be present on a diskette or CD. The immediate source of the e-mail note, downloaded file, or disk
you've received is usually unaware that it contains a virus.
Some viruses begin their destructive effect as soon as their code is executed; other viruses
lie dormant until circumstances cause their code to be executed by the computer. Some viruses are
harmless but they can be playful.
Viruses have strange and sometimes even fanciful names in order to catch the attention of
the user. Armageddon, Burger, Happy Birthday, Ludwig are examples of certain viruses.
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