The VGA connector is a carry over from the office environment. You can use this connector to hook-up your laptop or desktop to your projector. I've used the VGA inputs on these type of projectors and thought the image looked very nice from my laptop DVD player. Component is comparable to VGA. A non-videophile probably couldn't tell the difference between a VGA input and a component input. Skip the composite and S-video connections if you can. You'll probably see image degradation with these inputs.
There is a lot of debate about connections on this site. You might continue doing some searching through the links. Happy hunting.
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