It is said that there are three types of the computer virus; Trojan Horse, Spyware, and Spam. A Trojan Horse takes credit card details or bank passwords. A Spyware gathers information in a computer. A Spam is used to fool people and to get money from them (Philpot, 2011: 47).
Reference:
Philpot, S. (2011). “Computers under Attack.” Academic Skills. Oxford: Spain
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