It can destroy operating systems and other programs by corrupting their data. Viruses can be passed from one computer to another through files on floppy disk.
Worm is a self –copying computer virus.
It usually performs malicious actions, such as using up the computer’s resources and possibly shutting the system down.
A destructive program that impersonate as a kind application.
One of the most dangerous types of Trojan horse is a program that claims to rid your computer of viruses but instead introduces viruses onto your computer.
Electronic junk mail or junk newsgroup postings. It’s unwanted e-mail.
Spam is generally e-mail advertising for some product sent to a mailing list or newsgroup.
Different Types of Viruses
Direct Action Viruses
Trojans or Trojan Horses