Computers under Attack

There are three types of computer virus that cause difficulties for many users. One type is a Trojan Horse, it is created to take credit card details or bank passwords. A Spyware is the next type, it gathers information about the computer’s owner.  A Spam is the last type that is used to cheat people and to get money from them (Philpot, 2011: 47).

Reference: 
          Philpot, S. (2011). “Computers under Attack.”  Academic Skills. Oxford: Spain.