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Fully known as Portable Document Format (PDF), the format is by far the most popular and widely supported by almost all e-readers and devices out there. It is open standard so you can get it easily, however, it is not reflowable which means it does not automatically scale to the size of your device. Also, this file is less interactive like an embaned dictionary, Quiz, live video streaming, and others. However, this is not the best option if you want to sell your content, as it does not really implement DRIM. and is not the best idea if you want to avoid piracy.
EPUB
The title of the most sold ebook would go to EPUB because it is largely supported by most e-readers and it is open standard with no proprietary ties to any vendor. It is the second most popular ebook format and can be opened by almost any e-reader or ebook reading device. You can also easily add DRIM to your EPUB content although it can be removed too. It is widely available and supports images, graphics, alongside other multimedia. It can even be encrypted with variations such as the EPUB2 and EPUB3 available. The latter is the latest and support interactive content, unlike the rest which is its predecessors.
MOBI
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AZW
IBA
The last on the list is IBA, created by Apple as the format in which ebooks are made using the iBooks Author app. The proprietary format is not widely readable like the rest and even so, it comes only Apple devices. Even ebooks from iTunes are in EPUB format which shares some similarities with IBA. There is also support for DRIM restriction on the ebook format and active interaction too.
