What is a worm?
A worm is a program that spreads over a network. Unlike a virus, a worm does not need to attach itself to a host program for propagation. Some worms use email to spread, sending themselves out as an attachment to other users. Some of them exploit the vulnerabilities in software running on a victim’s machine, aiming to take control of those systems. Some worms also spread by using cross-site scripting vulnerabilities in web servers or services.
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