Mobi e-books are mainly divided into two standard Kindle e-books: KF7 (also called mobi7) and KF8 (also called mobi8).
Mobi7 does not support rich typesetting formats such as changing fonts and bolding in Kindle, while mobi8 supports these rich typesetting formats. But Amazon does not support mobi8 mailbox transfer to Kindle.
In order to make e-books support rich typesetting and email transmission at the same time, it is suggested to convert them into Kindle e-books (in both formats) with Calibre.
azw3:
Azw3 is gradually replacing mobi as the mainstream format of Kindle e-books.
Azw3 can be understood as a "shell" that Amazon added to mobi8 e-books in order to better protect the copyright (DRM protection) of e-books.
However, Amazon currently does not support transferring e-books in azw3 format to Kindle, which means that you can't store e-books in azw3 format to Amazon Cloud, nor can you synchronize them with your other Kindle devices or KindleAPP.
In order to make azw3 e-book format support rich typesetting and e-mail transmission at the same time, it is also suggested that you use Calibre software to convert it into a mixed mobi7 and mobi8 e-book format (both of them), and then send it to Kindle by e-mail.
epub:
The biggest feature of eBook in epub format is its versatility, and it is the eBook that currently supports the most reading software (such as browsers and basically all reading APPs except Kindle APP).
In addition, epub format is more compatible with complex typesetting, charts, formulas and other elements than mobi format, and supports multimedia content such as sound and images.
In fact, Amazon developed mobi format and azw3 format based on eBook in epub format. Why doesn't Amazon Kindle choose epub, a standard e-book format commonly used by competitors (such as Google and Apple)? Amazon's explanation is this: our innovation speed is very fast, and by adopting our own standard format, we can quickly combine innovations into products. For example, Whispersync technology (which can synchronize the reading progress information of e-books to various readers through wireless Internet access) and the technology of enlarging and reducing fonts.
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