What is a worm?
A worm, like a virus, is designed to copy itself from one computer to another, but does so automatically. First, take control of the characteristics of the computer that can transport files or information. Once a worm in your system, you can travel alone. The great danger of worms is their ability to replicate in large numbers. For example, a worm could send copies of itself to all users in your address book, e-mail, causing a domino effect of heavy network traffic that would slow the business networks and the Internet in its entirety. When new worms are unleashed, they spread very quickly. Clogging networks and possibly making you wait long (at all) to view Web pages on the Internet.
Generally, worms spread without user action and distributes complete copies (possibly modified) of itself across networks. A worm can consume memory or network bandwidth, which can cause a computer to crash.
Because worms do not have to travel through a program or file "host" can also tunnel into your system and allow somebody else to take control of your computer remotely. Recent examples of worms include: sasser and blaster.
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