Virus

Viruses - A computer virus is a small piece of packet that piggybacks on real programs. For example, a virus might tie up itself to a program such as a spreadsheet program. for each one time the spreadsheet program runs, the virus runs, too, and it has the chance to reproduce (by attaching to new-fangled(prenominal) programs) or wreak havoc.

E-mail viruses - An email virus travels as an attachment to e-mail messages, and usually repeats itself by automatically card itself to dozens of people in the victims e-mail address book. approximately e-mail viruses dont even require a double-click -- they launch when you ensure the infected message in the preview pane of your e-mail softw atomic number 18

Trojan horses - A Trojan horse is simply a computer program. The program claims to do one thing (it may claim to be a game) but instead does maltreat when you run it (it may erase your hard disk). Trojan horses book no way to replicate automatically.

Worms - A worm is a small piece of software that uses computer networks and security holes to replicate itself. A copy of the worm scans the network for another auto that has a specific security hole. It copies itself to the new machine apply the security hole, and then starts replicating from there, as well.


Virus Origins

Computer viruses are called viruses because they share some of the traits of biological viruses. A computer virus passes from computer to computer like a biological virus passes from person to person.
Unlike a carrel, a virus has no way to reproduce by itself.



Instead, a biological virus must inject its desoxyribonucleic acid into a cell. The viral DNA then uses the cells existing machinery to reproduce itself. In some cases, the cell fills with new viral particles until it bursts, releasing the virus. In other cases, the new virus particles bud off the cell one at a time, and the cell remains alive.
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