FB2 is an eBook format used primarily for storing and distributing fiction books. It is an XML-based format that supports text, images, and hyperlinks. FB2 files are lightweight and ideal for sharing books across different platforms and devices, particularly in the Russian-speaking community.
OEB is an ebook format used by the Open eBook standard for digital publications. It supports rich text, images, and hyperlinks, and is commonly used for distributing digital books and content. OEB files are now considered obsolete, replaced by the more widely used EPUB format.