Virtual Image: when we look at the mirror we can see our image. It's the same thing in computer, where you will put program/movies/games cd/dvd and the program called "Alcohol 120%" will create Virtual Image. Which you can use as another cd/dvd.


Advantage:
You can see another 1 new cd/dvd-Drive, where you can use virtual images as a cd/dvd.
Some of the game needs to play by putting and using CD/DVD. And it will heat up your cd/dvd ROM if you do so and can damage but if you make virtual image you don't need to put cd/dvd anymore and can use from hard disk.

Don't Be confused
For example; i want to make another copy of my "vista DVD", so i just copy as usual way, first in my laptop and then copy to new DVD but that new DVD will not work why? because you can't make it bootable. So that's why if you want to make exact copy you need to make virtual image first and then copy to new DVD’s.
So all you need is, these software
Download Alcohol 120% (Works on xp/vista)