What is 3G anyway?

I must admit that I didn't know the difference between 2G and 3G wireless technologies until recently. Whenever a discussion comes up among our friends about 3G, everyone seemed to be offering some opinion but me. So I ventured into understanding what is 3G. I know that I don't need to delve deeper to debate about 3G, but to understand it from a layman's perspective. One of the pages that I found was helpful was RadioShack's comparison page that tabulates the difference between different generations. That was a good starting point, from where I went to Wiki to learn more about each generations. I found the following pages to be helpful:

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