A worm is a type of malware that autonomously replicates itself and spreads to other computers over a network. Unlike a virus, it does not need to attach to a host file and can operate and propagate independently, often spreading rapidly through email attachments or network shares. Worms can cause damage by consuming large amounts of bandwidth or by installing additional malicious programs.

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• 2009h21a #58インターネットなどのネットワークを介して，自分自身の複製を電子メールに添付して勝手に送信したり，ネットワーク上のほかのコンピュータに自分自身をコピーしたりして，…