Another malicious program can affect your computer is known as a “worm”. A computer worm is developed and programmed to copy and distribute itself to other computers over the Internet, usually without the user knowing. Worms are different from viruses in that they often do not destroy programs or data, but that does not mean they do not cause damage. The biggest problem with computer worms is how quickly they spread. Worms can reproduce very quickly and all of that traffic on the network slows down normal usage. It can stop internet browsing or opening documents and grind all activity to an annoying halt.

Worms typically exploit bugs or security holes in Internet browsers or email clients. Some programmers who have a dislike for Microsoft will create worms that utilize security holes in its software to spread itself. Computer worms can also be spread by tricking the user into opening a malicious website or email attachment. You can protect yourself (and others) from computer worms by installing anti-virus software and making sure your system is up-to-date.

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