Can you give an example of terms that you're having trouble with?
The problem is that the Wikipedia is targeted toward the average technical reader, so from our (or at least my) perspective it is pretty simple already and it avoids the complex issues.
I'll be glad to help you, but right now I don't understand how. Can you explain what you know or at least think that you know, then follow that explanation with questions about the parts that are causing you trouble? That would give a much narrower field, which I think I could help you understand much better.
An introductory lecture on ODBC, JDBC, and Database Drivers with some examples would easily fill an hour verbally with 20 to 30 presentation slides. That's way too much information to cram into a forum response.
-PatP