CHM is a compiled help file format used for delivering help documentation. It stores text, images, and other multimedia elements in a single file. CHM files are commonly used in software applications to provide user guides, manuals, and other technical documentation that can be easily accessed by users.
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.