What is Computer virus?

Understanding Computer virus

A program written with functions and intent to copy and disperse itself without the knowledge and cooperation of the owner or user of the computer. A computer virus is a type of malicious software that attaches itself to legitimate programs and replicates by infecting other programs or files when executed. Viruses can damage data, steal information, or degrade system performance. Unlike worms, viruses typically require user action to spread. Protection against viruses is addressed in frameworks like NIST SP 800-83 and ISO 27001. Organizations implement virus protection through anti-malware software, email filtering, user training, and regular system updates. For example, an organization might deploy endpoint protection platforms that use signature-based detection, behavioral analysis, and machine learning to identify and block virus infections before they can spread. Related terms: Malware, Worm, Trojan, Anti-virus, Infection vector, Payload, Polymorphic virus.