Self-replicating malware that attaches to legitimate programs and spreads when those programs run.
A computer virus is malware that attaches itself to legitimate programs or files and replicates when those programs execute. Like biological viruses, computer viruses need a host (the infected file) and spread through user actions—running infected programs, opening infected documents, or sharing infected files. Viruses were the dominant malware type historically, leading to 'antivirus' software. While true viruses are less common today, the term is often used generically for all malware.
Why It Matters
The DSC Perspective:
Understanding viruses explains why email attachment scanning and download restrictions matter. The concept of self-replicating malware remains relevant even as threats have evolved.