Wikipedia
A computer worm is a standalone malware computer program that replicates itself in order to spread to other computers It often uses a computer network to spread itself, relying on security failures on the target computer to access it It will use this machine as a host to scan and infect other computers When these new worm-invaded computers are controlled, the worm will continue to scan and infect other computers using these computers as hosts, and this behavior will continue Computer worms use recursive method to copy themselves without host program and distribute themselves based on the law of exponential growth, and then controlling and infecting more and more computers in a short time
Computer_worm - Wikipedia, the free encyclopedia