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.epub - Electronic Publication format, widely used for eBooks.
.mobi - Mobipocket eBook format, compatible with Amazon Kindle devices.
.pdf - Portable Document Format, not exclusive to eBooks but commonly used for them.
.azw - Amazon Kindle eBook format.
.azw3 - Amazon Kindle eBook format with enhanced features.
.ibooks - Apple iBooks format.
.lit - Microsoft Reader eBook format (obsolete).
.pdb - PalmDOC eBook format.
.html - HyperText Markup Language, used for web-based eBooks.
.txt - Plain text format, often used for eBooks with simple formatting.
.cbz - Comic Book Zip, used for digital comic books and graphic novels.
.cbr - Comic Book RAR, another format for digital comics.
.fb2 - FictionBook eBook format.
.djvu - DjVu format, primarily used for scanned documents and eBooks.
.lit - Microsoft Reader eBook format (obsolete).
.pdb - PalmDOC eBook format.
.mobi - Mobipocket eBook format (also used for Amazon Kindle).
.opf - Open eBook Publication Structure format.
.azw4 - A variation of the Amazon Kindle format.
.prc - Mobipocket eBook format (obsolete).