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Computer virus. Conceptual computer artwork of a computer virus, represented by the skull that has bolts of lightning emerging from it, and the word virus replicated across the computer screen. The skull and lightning represent the damage that a computer virus can cause. A computer virus is a computer program that is usually designed to carry out harmful instructions and then copy itself to other computers. (KEYSTONE/SCIENCE PHOTO LIBRARY/VICTOR HABBICK VISIONS)