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wi-fi means you need to have a wireless access point to get on the Internet. That's how laptops typically get on the internet. 3G is a type of digital wireless that some cell phones use. 3G internet runs through cell phone towers so your coverage is similar to a cell phone. So for wi-fi if you're away from home, you'd have to find a wireless hot spot to get back on the internet. Fast food places, libraries, etc tend to have that them. 3G will get internet just about anywhere an AT&T phone will get reception. Personally I love my 3G Kindle because I can fool around on the internet while we're on long car trips but your mileage may vary.
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