Computers under Attack

          It seems that three kinds of computer virus are designed to cause  problems. They are Trojan Horse, Spyware, and Spam. A Trojan Horse is a computer program designed for taking credit card item. A Spyware saves detail of the owner’s computer. A Spam is unwanted advertisement, and it was used to hoax people and to take money from them (Philpot, 2011:47).

References: 

Philpot, S. (2011). “Computers under Attack.” Academic Skills.

                    Oxford: Spain