Why is better DVI than VGA? and when?

[heptagono]

Hi, folks! This is my first post, so I would like to say hello to everyone here.

I have a question, indeed:

¿Why is better DVI than VGA?

This question is usually answered with a : "Because DVI is digital", but I know that there are three kinds of DVI, digital, analogic, and combined.

Also, I don't know if when you plug-in a VGA to DVI converter on your graphic card's video output, you are actually transforming a VGA-analogic signal into a DVI-digital signal. Or just it remains an analogic signal.

The only advantatge of digital video signals is their resistance to interferences? There is any other advantage?

Thanks a lot. I think this could be a very interesting subject to develop.

I look foward to your response!

 

[kenrivers]

For some technical information on VGA and DVI check out these links:
http://en.wikipedia.org/wiki/VGA
http://en.wikipedia.org/wiki/DVI
http://www.differencebetween.net/technology/difference-between-vga-and-dvi/
http://computer.howstuffworks.com/monitor3.htm