Computer Virus is a program that infects some executable software of the computer and causes that software, when run, to spread the virus to other executable software. The virus may also contain a payload which performs other actions, often malicious. A Computer worm is the program which actively transmits itself over a network to infect other computers. It too may carry a payload. The difference between the virus and worm is that the virus requires user intervention to spread, whereas a worm spreads automatically. Infections transmitted by email or Microsoft Word documents, which depends on the recipient opening a file or email to infect the system, can be called as viruses rather than worms.

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