A worm spreads itself not only from file to file, but also from computer to computer. The primary difference between a virus and a worm is that a virus must attach to something, such as an executable file, to spread. Worms do not need to attach to anything to spread and can tunnel themselves into computers.

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Worms are self-replicating malware that do not require attachment to a host file to spread, unlike viruses, which need to attach themselves to an executable file or document to move from one system to another. Worms can exploit network vulnerabilities to spread from computer to computer on their own.

A Worm Spreads Itself Not Only from File to File