Ebooks have become a popular way of reading books in the digital age, with many people opting for this convenient and accessible alternative to traditional physical books. With the rise of ebooks, various ebook formats have emerged, each offering different features and compatibility with different devices. In this article, we will outline the most famous ebook formats, including PDF format, and the device types that are supported.

PDF (Portable Document Format)
PDF is a popular ebook format that is widely used for reading and sharing digital documents. PDF is an open standard format that provides a consistent and reliable way of displaying and printing electronic documents, regardless of the device or software used. PDF files can be read on a wide range of devices, including computers, laptops, smartphones, and tablets. PDF files are often used for books, magazines, and other types of publications that require a fixed layout.

EPUB (Electronic Publication)
EPUB is a free and open ebook standard that is designed specifically for reflowable content, meaning that the text adjusts to the size of the device being used to view it. This makes EPUB an ideal format for reading books and other content on small screens, such as smartphones and e-readers. EPUB files can be read on most e-readers, including the Amazon Kindle, the Barnes & Noble Nook, and the Kobo e-reader, as well as on many smartphones and tablet devices.

MOBI (Mobipocket)
MOBI is a proprietary ebook format that was created by the French company Mobipocket. It is now owned by Amazon, and is used primarily for books purchased from the Amazon Kindle Store. MOBI files can be read on a wide range of devices, including the Amazon Kindle, smartphones, and tablet devices. However, MOBI files are not as widely supported as PDF and EPUB files, and are not compatible with all e-readers.

AZW (Amazon Kindle Format)
AZW is a proprietary ebook format that is used specifically for books purchased from the Amazon Kindle Store. It is a variation of the MOBI format and is designed to work exclusively on Amazon Kindle devices. AZW files can be read on the Amazon Kindle, as well as on Kindle apps for smartphones and tablet devices.

FB2 (FictionBook)
FB2 is a free and open ebook format that was developed in Russia. It is designed specifically for fiction books and is supported by a number of ebook readers, including the Amazon Kindle, the Barnes & Noble Nook, and the Kobo e-reader. FB2 files can also be read on many smartphones and tablet devices.

In conclusion, the most famous ebook formats include PDF, EPUB, MOBI, AZW, and FB2. Each of these formats has its own features and compatibility with different devices, making it important to choose the right format for your needs. Whether you're reading books on a smartphone, tablet, or e-reader, there is an ebook format that will work for you.