Mobi is a digital format designed for eBooks, primarily used by the Amazon Kindle and other e-readers. It allows for easy reading on various devices, supporting features like bookmarks, annotations, and adjustable font sizes. The format is known for its efficient compression, making it suitable for mobile devices. Originally developed by Mobipocket, Mobi has evolved over the years and is now part of the Kindle ecosystem. It supports DRM (Digital Rights Management) to protect copyright, ensuring that authors and publishers can control the distribution of their content.