VGA and DVI is in the way the video signals travel. VGA connectors and cables carry analog signals while DVI can carry both analog and digital. DVI is newer and offers better, sharper display compared to VGA. You can easily tell them apart because VGA connectors (and ports) are blue while DVI connectors are white. Click the link below to see an image of them.
http://www.hardwaresecrets.com/imageview.php?image=8131
SOURCE: If you add a DVI adapter to the the DVI cable
For the best results, you a straight DVI cable.
VGA is analog, while DVI is digital. The quality will not be as good a a regular DVI cable.
You can use a DVI to HDMI.
I use one going from my PC to TV and the quality is awesome.
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