Difference between Virus and Worm???

A virus is a program that is designed to spread from file to file on a single PC, it does not intentionally try to move to another PC, and it must replicate, and execute itself to be defined as a virus.

A worm is designed to copy itself (intentionally move) from PC to PC, via networks, internet etc. A worm doesnt need a host file to move from system to system, whereas a virus does. So worms spread more rapidly then viruses.

                   The difference between a worm and a virus is that a virus does not have a propagation vector.i.e. it will only effect one host and does not propagate to other hosts. Worms propagate and infect other computers. Majority of threats are actually worms that propagate to other hosts.

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