What are Worms and Viruses worm vs virus
VIRUS
It is a program designed to change the way your computer operates without your permission or knowledge. When a virus attaches itself to another file, it infects it. Any time you activate an infected file it can damage files, cause erratic system behavior, or display messages. Some system viruses are programmed specifically to corrupt programs, delete files, or erase your disk. Viruses are inactive until you run an infected program, start your computer from a disk with infected system files, or open an infected file. Once a virus is active in memory it can infect any other programs, local or network, that you run. Files infected with a virus can be inoculated (the virus is removed from the program).
WORM
Worms are a close cousin to viruses and Trojan Horses. Unlike a virus they don't infect other programs. They do however make many copies of themselves in memory, which effectively consumes all your memory. This leaves no memory to run you regular programs. Your PC may behave very erratically, or just grind to a halt! Some worms get into your e-mail list and e-mail themselves to everyone on your e-mail list without you knowledge. When each unsuspecting recipient opens such an e-mail, it broadcasts itself to everyone on their e-mail list. This is how worms rapidly travel throughout the Internet! Worms can not be repaired since they are not viruses. They must be erased from your computer, the sooner the better!
This explains difference between worm and virus
VIRUS
It is a program designed to change the way your computer operates without your permission or knowledge. When a virus attaches itself to another file, it infects it. Any time you activate an infected file it can damage files, cause erratic system behavior, or display messages. Some system viruses are programmed specifically to corrupt programs, delete files, or erase your disk. Viruses are inactive until you run an infected program, start your computer from a disk with infected system files, or open an infected file. Once a virus is active in memory it can infect any other programs, local or network, that you run. Files infected with a virus can be inoculated (the virus is removed from the program).
WORM
Worms are a close cousin to viruses and Trojan Horses. Unlike a virus they don't infect other programs. They do however make many copies of themselves in memory, which effectively consumes all your memory. This leaves no memory to run you regular programs. Your PC may behave very erratically, or just grind to a halt! Some worms get into your e-mail list and e-mail themselves to everyone on your e-mail list without you knowledge. When each unsuspecting recipient opens such an e-mail, it broadcasts itself to everyone on their e-mail list. This is how worms rapidly travel throughout the Internet! Worms can not be repaired since they are not viruses. They must be erased from your computer, the sooner the better!
This explains difference between worm and virus
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