AZW4 is an ebook format developed by Amazon for Kindle devices. It is based on the EPUB standard but includes DRM protection for preventing unauthorized distribution. AZW4 files are typically used for selling ebooks on Amazon’s Kindle platform and are optimized for reading on Kindle devices and apps.
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.