RetroPie is a software package that allows users to turn a single-board computer, like the Raspberry Pi, into a retro gaming console. It supports a wide range of classic gaming systems, enabling users to play games from platforms such as NES, SNES, Sega Genesis, and more. The software provides an easy-to-use interface for managing and launching games. To use RetroPie, users typically need to install the software on their device and configure it with game ROMs, which are digital copies of games. The platform also supports various controllers, making it accessible for both new and experienced gamers who want to relive nostalgic gaming experiences.