Learn in the textbookMalware Basics and Major Infection Types
DefinitionA worm (ワーム) is malware that needs no host: it copies itself and spreads to other computers over a network.
ExplanationA worm runs as an independent program in its own right. Because it can keep sending out copies with no human action, it can reach large numbers of devices in a short time and sometimes puts a heavy load on the network.
AnalogyPicture a double that opens the door to the next room on its own, makes a copy of itself there, and then heads for the room after that.
Memory hookWorm is English for a crawling creature. Picture it moving around on its own body, with no host to lean on.