Here are terms used in digital and print publishing.
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An ePub is the file used by most retailers and reading devices. It contains the entirety of a book — text, images, tables of contents, indexes.
There are two versions in use right now: ePub2 and ePub3. Version 2 is on its way out. Most retailers and reading systems are becoming more and more able to read ePub3. Version 3 includes more stylistic, content, and interactive features.
This is the file uploaded to Amazon. It is similar to ePub 3. The background file format contains both KF8 (the most current, used on the Fires and newer Kindles) and Mobi7, which is read by older Kindles.