Virus

A computer virus is program that multiplies itself on computer systems and incorporates itself into shared programs. Some viruses are harmless pranks, and others can destroy computer files or disable a computer entirely. A key quality of viruses is that they spread quickly, from user to user.

Viruses are most commonly spread through e-mail. Certain viruses use personal e-mail address books to send the damaging programs from computer to computer. To prevent against receiving an unwelcome virus, do not open any e-mail attachments from people that you do not know.

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