Question

what's difference between virus and worm?

Answer 1

Worms spread by itself it doesn't depends on others .
while virus are depends on the host to spread.

Answer 2

Viruses require an active host program or an already-infected and active operating system in order for viruses to run, cause damage and infect other executable files or documents. Worms are stand-alone malicious programs that can self-replicate. Virus does not propagate while worm propagates. Worms use Computer Networks to spread itself while Viruses spread to different systems through executable files. Spreading speed of a Worm is faster than a Virus. The virus needs human action to replicate, whereas, Worms don't.