What is the difference between wifi and the 3G plus wifi?

I want to get an ipad for myself and I have no idea what the difference is between the regular wifi and the 3G plus wifi.  If somebody could explain the difference to me so I can decide which one to get I would greatly appreciate it.  Thank you in advance!

On the iPad if you use wifi you have to be close to a wifi access point either in your home or at a location such as Starbucks or Paanera. This connection normally will transfer data faster than 3G. However, 3G will give you access in areas where there is mobile telephone service from Verizon or AT&T albeit at a slower data transfer rate than wifi.
Wifi will be cheaper than 3G since you'll have to subscribe to 3G service from Verizon or AT&T.
BTW, you won't be able to use "3G plus wifi" at the same time.

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