Computers under Attack

There are three kinds of virus causing troubles for any computer users:       a Trojan Horse, Spyware, and Spam.  The first type is a Trojan Horse.  It is devised to obtain credit card details or bank passwords.  Spyware is another one.   Data about the computer’s owner is gathered by it.  The final type that has less hazardous difficulty for computer users is Spam.  It is used for deceiving people and taking money from them.  (Philpot.  2011 : 47)

Reference:

Philpot, S.  (2011).  Academic Skills.  Oxford : Spain.