Worm

Viruses Are far from The only maverick programs that can disrupt a computer system.Worms are constructed to infiltrate  legitimate data processing programs and alter or destroy  the data. Often what  people believe is a virus infection is, in fact , a worm program. This is not as serious because worms do not replicate themselves.But the damage caused by a worm attack can be just as serious as a virus, especially if not discovered in time. For ex. suppose a worm program instructs a bank's computer to transfer funds to an illicit account.The fund transfers may continue even after the worm is destroyed.However, once the worm invasion is discovered , recovery is much  easier because there is only single copy of worm program to destroy since the replicating ability of the virus is absent .A worm is similar to a benign tumor while a virus is like a malignant one.