Convert otb to mobi

What is the difference between .otb and .mobi?

Description: The OTB (Nokia Over The Air Bitmap Image) file format is a type of image file developed for use on Nokia mobile devices. These files are specifically optimized for efficient transmission and display on Nokia phones, particularly older models. The OTB format is designed to be compact to facilitate over-the-air (OTA) transmission, which was an essential feature in the era of limited bandwidth and data transfer capabilities. The format supports monochrome graphics, making it suitable for simple images like icons and logos.; A MOBI file is an eBook saved in the MOBI format, a format originally used by the Mobipocket Reader but now supported by several different readers. It contains an eBook and may incorporate DRM copyright protection to prevent copying or unauthorized viewing. MOBI files are supported by various eReaders, tablets, PDAs, and desktop computer applications.