A worm is a type of malware that replicates without any intervention. It jumps from one digital device to another by leaving a copy of itself on anything that connects to the infected system. 

For instance, it can stay on your computer seemingly harmless until you plug a USB stick. That thumb drive will carry a copy of the worm to other computers it gets plugged in to. Worms can also end up in a computer through a malware-carrying email attachment or when users access a contaminated website.

Digital worms behave very much like the parasitic worms after which they were named. They live within the bodies of animals. Some of them may transfer into other animals that come in contact with their host. So digital worms spread across computers and devices the same way parasitic worms  spread throughout the population.

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