@croberts
Basically, there are many formats to ebooks, there are many different devices (and reader software) that you can use to consume the content. An early version (Circa 1968) is the Dynabook (http://en.wikipedia.org/wiki/Dynabook). You can use a dedicated device (such as an Amazon Kindle or B&N Nook) or a tablet/laptop/desktop with some reader software (Kindle, Nook, etc.).
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