TERMS
Data Projectors vs Video Projectors?
Nearly all projectors today work with DVD's, video players, laptops  and computers. Some work with smart cards, wireless etc. So in that case their is today no difference between data projectors and video projectors (although many older projectors need attachments to do data)

What is DLP™ technology?
Digital Light Processing is the world's only all digital display. DLP™ technology uses an optical semiconductor to recreate source material with a fidelity analog systems cannot match. 
Is easy terms quality like a DVD (Digital) player rather than a video player (Analogue)

What are the main resolutions?
SVGA is resolution of 800 by 600 [pixels
Short for Super VGA, a set of graphics standards designed to offer greater resolution than VGA. SVGA supports 800 x 600 resolution, or 480,000 pixels. 

XGA  is resolution 1024 by 768 pixels
Short for extended graphics array, a high resolution graphics standard introduced by IBM in 1990. XGA was designed to replace the older 8514/A video standard. It provides the same resolutions (640 by 480 or 

True Resolution vs Native Resolution? (Normal vs wide screen)
If a projector's native resolution is 1024 x 768 (XGA), that means that the actual number of physical pixels on the display device is 1024 x 768. In some projector models, specifications show compatibility with higher resolutions. This is achieved through the use of compression technology. Compression technology displays a perfectly acceptable image, but is not matched pixel for pixel from computer to projector to screen.

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Email Rob Lamont for more info