DietPi is a lightweight Linux distribution based on Debian that is designed to be used on single-board computers such as the Raspberry Pi, Odroid, and Orange Pi. It includes a variety of software options that are optimized for these types of devices, and it is intended to be easy to set up and use. DietPi also offers a variety of features such as a software installer, automatic software updates, and a web-based user interface for managing the system.