A virus is a self-replicating program that spreads by inserting copies of itself into other executable code or documents. A computer virus behaves in a way similar to a biological virus, which spreads by inserting itself into living cells. Extending the analogy, the insertion of the virus into a program is termed infection, and the infected file (or executable code that is not part of a file) is called a host.

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virus is a program code or program that spreads by copying or initiating its copying to another program, computer boot sector or document. The virus can be transmitted as attachments to e-mail note or a downloaded file, or be present on a diskette or CD.

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virus is a program code or program that spreads by copying or initiating its copying to another program