All Evil Code (Malicious Code) is not the virus

One perception is mistaken in the computer society of other bad electronic code, such as worms and Trojan horse applications is the type of virus. They are not viruses. Worms, Trojan horses, and viruses in a large category of so-called analyst as "malicious code".

A worm will replicate itself and enter into a network connection to infect every machine on the network and then replicate itself again, taking the hard disk space and slow down computer performance and network. Even so, the worm does not modify or delete other files.

A Trojan horse does not replicate itself, but he was in the form of a malicious program disguised as another format such as a screen saver or image file. When executed on your machine, a Trojan horse will take the information from your system - such as user name and password - or they can create a malicious hacker take over your computer remotely (from a distance).