Virus - Program designed to copy itself between and within computers, to deliberately damage it., Worm - Spreads around a computer system by replicating itself., Trojan Horse - Gains entry to a user’s computer ‘in disguise’ as the user is tricked into thinking that it is a useful piece of software., Key Logger - Records a user’s keystrokes without their knowledge, Spyware - Malicious software which is secretly installed on a user’s computer.,

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