FictionBook 2.0 (.fb2)
The FB2 file extension signifies the FictionBook 2.0 eBook format, rooted in XML and predominantly tailored for fictional narratives. This format, developed in Russia, ensures a uniform structural framework for content across an array of devices and eReader platforms. The design principle of the FB2 format is to decouple the eBook's structural composition from its visual presentation, facilitating seamless adaptability to alternate formats and delivering a stable reading experience.