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Here's an interesting link that shows the evolution and timeline of worms and viruses.
Hex dump of the Blaster worm, showing a message left for Microsoft co-founder Bill Gates by the worm's programmer (Above)
A worm is similar to a virus by its design, and is considered to be a sub-class of a virus. Worms spread from computer to computer, but unlike a virus, it has the capability to travel without any help from a person. ... Unlike viruses, Trojan horses do not replicate themselves but they can be just as destructive.
Difference between Viruses and Malware