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Computer Virus: Computer virus is a set of code that is able to be copied by itself and then corrupt the whole system or destroy some data from the computer memory. Some of the computer viruses are Trojan Horses, Worm, Malware, Spyware and so on.

Trojan Horse: This is a computer virus which spread only when copied to another system and pretend to use the whole system while they are doing something destructive in the system.

Worm: Worm can replicate itself and use memory. It is unable to add itself to another system.

Malware: Malware can damage the computer system as intelligently so that the suer doesn’t get any knowledge about it.

Spyware: Spywar is also a kind of malware. When installing in a computer it collects information about users without informing them and transfers them somewhere else. Password is such kind of user information.

Antivirus: This is also a set of program which can identify the viruses in the computer system and prevent them and save the system.