Computer security is the process of preventing and detecting unauthorized use of your computer. Prevention measures help you to stop unauthorized users (also known as "Hackers") from accessing any part of your computer system. Detection helps you determine whether or not someone attempted to break into your system, if they were successful, and what they may have done.
To learn more about computer security, you may want to visit the US CERT Coordination Center at http://www.cert.org/.
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