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Kindle only accepts PDF and MOBI (AZW) files and almost everybody else can read ePUB files. So two should be MOBI and ePub. PDF does not work very well on small mobile screens but is popular so I would call it the 3rd format. TXT is too basic to provide a reasonable reading experience if there is a need for even primitive formating or italics or bold or anything else. A few older PDA's may want LIT but it is now going out of favor. However those devices would also work with eReader format which has a PDB extension but that is not an exclusive extension. You can also read about eBook formats in our wiki.
Dale
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