Difference between Kindle WiFi and Fire?

My boyfriend and I planned to get our mums a Kindle each for Christmas, but we'd like to know as much as possible about each type before we buy them so we can suss out which one is best for their requirements and what they will use the Kindles for. Basically, I'd like to know what you can do on each, and... show more My boyfriend and I planned to get our mums a Kindle each for Christmas, but we'd like to know as much as possible about each type before we buy them so we can suss out which one is best for their requirements and what they will use the Kindles for.
Basically, I'd like to know what you can do on each, and whether or not they're actually all that different?
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