A computer virus is an illegal and potentially damaging computer program designed to infect other software by attaching itself to any software it comes in contact with. In many cases, virus programs are designed to damage computer systems maliciously by destroying or corrupting data. If the infected software is transferred to or accessed by another computer system, the virus spreads to the other system. Viruses have become a serious problem in recent years, and currently, thousands of known virus programs exist.
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