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Don’t know what a worm is or what it does ? Here you go :

A Worm is an independent program, which copies from computers to computers. The difference between a worm and a virus is that the worm cannot be transplanted to another program and thus infect it, it is simply going to copy via a network or Internet, from computers to computers. One of the most famous worms, named “to slammer “, infected numerous computer systems in 2003, it perturbed in particular banking services and caused numerous delays in the air journeys by making inaccessible certain Web site. This type of replication can affect thus not only a computer, but also degrade the performances of the network in a company. As a virus, this worm can contain a harmful action of the type destruction of data or sending of confidential information.