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Most widely used format. Please take into account that PDF eBooks don't always display well on smaller screens. Furthermore, you can't change between fonts unlike EPUB and MOBI.
Most tablets and eReaders (including the iPad and Nook) and smartphones (including the iPhone and Android) can read eBook files in the popular EPUB format. If versatility is important to you, choose EPUB; it's compatible with almost all devices and will look best on the screen of your specific device. Learn more about EPUB here.
Kindle eReaders use Amazon's MOBI file format. MOBI-formatted books can also be viewed on iPhone, iPad, and BlackBerry devices, as well as personal computers, via the Kindle app. Other eReaders, however, such as the Nook and Sony Reader, cannot read Kindle's MOBI eBooks.
Learn more about MOBI here.
Note regarding MOBI and EPUB files:
After downloading, if you can't open the MOBI or EPUB file directly on your phone or tablet, open it in your web browser and download it from there. Proceed by opening it using your favorite application.