Computer threats

PC users love to maintain their system in a good shape. They get annoyed when it is being attacked or invaded. The threats are in the form of computer viruses, worms, logic bombs and zombies. Computer viruses are those that usually reside in an infected program and replicate itself once inside the computer. Trapdoors are those that give an illegal shortcut to a program. Zombies are those that cannot be detected but are effective attackers. Worms are those that attack a remote system and can use it in turn to attack other systems. So we have to be aware of these threats and get a good antivirus that fights all these threats.