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You're correct, PDF is not a dedicated ebook format. While it is possible to read PDF files on many e-readers and mobile devices, PDFs were originally designed for printing and sharing digital documents in a fixed layout that preserves the formatting, fonts, and images.
EPUB (Electronic Publication) is currently the most widely used format for ebooks. It is an open standard format that can be read on various devices and software applications, and it allows for text reflow, adjustable font size, and other features that enhance the reading experience. Other popular ebook formats include MOBI, AZW, and KF8.
It's worth noting that some publishers and authors choose to distribute their ebooks in PDF format, particularly for books with a lot of graphics or formatting that may not translate well into other ebook formats. However, as you correctly pointed out, PDF is not a dedicated ebook format.
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