What's the difference between all the different iPads, in basic language. I have no idea what retina display means

I do not understand the technical differences between iPads. I currently have model MC707B/A version 7.1.2 64GB, but this does not work unless I am where there is wifi. This model is great for my requirements except I could do with one I can use where there is no wifi and I find the screen hard to see when outside. I do use it for taking photos and playing music, but not excessive amounts. Could anyone recommend which iPad would be best suited for my needs?

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