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Virus programs combine logic bombs, Trojan horses, or trap doors with the dangerous ability to reproduce and spread to other computer systems. This ability to directly or indirectly replicate and spread distinguishes viruses from other system threats and makes them particularly dangerous to networks, time‑sharing systems, bulletin boards, and operating systems with inadequate controls. While viruses are relatively new, logic bombs, Trojan horses, and trap doors have been around for years. Viruses that use these mechanisms with each other pose a significant threat to computer systems and networks.
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