LIT is an ebook format used by Microsoft’s Reader application. It was developed as a proprietary format for electronic books, supporting text, images, and hyperlinks. While it was once popular, the LIT format has been largely replaced by more widely accepted ebook formats like EPUB and MOBI.
AZW3 is a proprietary ebook format developed by Amazon for Kindle devices. It supports more complex content than older formats like AZW, including HTML5 and CSS3 elements, embedded fonts, and multimedia. AZW3 files provide better compatibility and richer features for modern Kindle devices and apps.