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Rootkit - a program that hides in a computer and allows someone from a remote location to take full control of the computer

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from TekType - The IT Consulting Blog

The Best Free Antivirus Software – Does it Really Work?

Antivirus program - protects a computer against viruses by identifying and removing any computer viruses found in memory, on storage media, or on incoming files

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Malware - programs that act without a user's knowledge and deliberately alter the computer's operations

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from HowStuffWorks

How Trojan Horses Work

Trojan horse - a program that hides within or looks like a legitimate program

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Virus - a potentially damaging computer program that affects or infects, a computer negatively by altering the way the computer works without the users knowledge or permission

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