Hi Judy,
I own the Nook from Barnes and Noble and love it. You can buy books from B&N or download from libraries that have electronic books. The ability to download from libraries is the reason we, my SO, better known as My Lover,

and I chose it over the Kindle. You do not need WI-FI. Once you have downloaded the book it is on your Nook, the same as downloading something to your PC. I'm not a techie but even I manage to borrow books from the library and download them, downloading books from B&N is even easier. B&N also has many free books you can download. I was reluctant to go to an e-reader but I love it.
Hope this helps. Happy reading.
Halle
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My goal in life is to be as good of a person as my dog already thinks I am.