MOBI is an ebook format used primarily by Amazon Kindle devices. It’s based on the open standard for digital publishing and allows for content reflow and support for images, links, and embedded fonts. MOBI files are widely used for ebook distribution and are compatible with various reading apps.
EPUB is an open-source ebook format designed for digital books. It allows text and images to adapt to different screen sizes, making it ideal for reading on various devices, such as smartphones, tablets, and e-readers. EPUB supports rich formatting, multimedia elements, and interactivity, offering a flexible and portable ebook format that is widely supported by ebook readers and apps.