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A '''computer worm''' is a malicious program that is self-replicating.  It typically makes use of a network to circulate duplicate copies of itself to other devices on the network.

A '''computer worm''' is a malicious program that is self-replicating and self-executing.  It typically makes use of a network to circulate duplicate copies of itself to other devices on the network.

In contrast with a [[computer virus]], a worm need not hide in an existing program.  Rather than requiring user action to steal, infect, or destroy files, a worm will connect and if possible, break in to other computers which its host computer has access to.  Like the [[Invertebrate]] it is named after, it could be said to crawl about and reproduce with no external assistance, rarely being noticed.  Worms are used as a delivery method form other [[malware]], such as [[spyware]] and [[Computer virus|viruses]].

In contrast with a [[computer virus]], a worm need not hide in an existing program.  Rather than requiring user action to steal, infect, or destroy files, a worm will connect and if possible, break in to other computers which its host computer has access to.  Like the [[Invertebrate]] it is named after, it could be said to crawl about and reproduce with no external assistance, rarely being noticed.  Worms are used as a delivery method form other [[malware]], such as [[spyware]] and [[Computer virus|viruses]].