Final answer:
A worm is a type of malware that replicates itself throughout a computer or network without any action required from the user.
Step-by-step explanation:
The type of malware that replicates itself throughout a single computer or across a network is called a Worm. Worms are self-replicating programs that spread without any action required from the user. They exploit vulnerabilities in computer networks and systems to propagate and infect other devices.