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What is a Virus?

By Amy Y.Wong
Click Here for her research paper

. . .A computer virus is a program that is self-replicating (copies itself).

Many people believe that any program that does something malicious to a computing system is a virus. This isn't true unless that program can reproduce itself. Computer viruses can cause the loss or change of programs or data. Viruses can spread from one program to another and from system to system.

When the code of a virus is executed, it spreads itself to other programs. A typical computer virus does two things. First, it copies itself into previously uninfected programs. Second, it executes other instructions that the virus creator has included in it. Some viruses don't have any harmful instructions at all. Instead, they cause damage by replicating and taking up disk space. . . (see the above link to Amy Y. Wong's excellent paper for more details).
Windows Virus Security Software Companies

McAfee Anti-Virus(Win95,DOS,Win3.11,Mac)

Updates for Norton Anti-Virus, Central Point, NAV

Dr Solomon's

Invircible Anti-Virus & Virus Trap Anti-Virus

Sophos Sweep Anti-Virus

Leprechaun Virusbuster & Macrobuster Anti-Virus

Safetynet Anti-Virus network protection

(Win95/NT, DOS, 3.11)

PC-Cillin Anti-Virus

Apple Virus Security Companies

Samantec Anti-Virus for Macintosh

Internet Text-only Tour

Virus site in Japanese


Virus site in English

IBM help for understanding Viruses

UEZUMI'sVirus Page
in Lov-e's Links Index
for more site listings

Virus postings in Japanese



Virus postings in English


Apple Virus Security Companies

McAfee Anti-Virus for Macintosh

Samantec Anti-Virus for Macintosh

Disinfectant Anti-Virus for Mac

Gatekeeper for Macintosh
(Discontinued but still available)

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