Sometime today, Philip S Tellis wrote:
Virus - self replicates (capable of reproduction) infects executable files a virus cannot exist without a host
Worm - uses a carrier to transmit itself. Does not infect files but sends itself as a whole. A worm does not use, nor can it use a host.
Trojan - A program that pretends to be something it is not. Example if a program is supposed to be a calculator, but actually deletes your files, it is a trojan. format.com in dos erases everything on you hard disk. This is expected behaviour, so format.com is not a trojan.
Virus - Internet Exploiter & Outlook Express Worm - w32.sircam Trojan - Windoze
Manish