OpenDOS is an open-source operating system that is based on the original MS-DOS. It provides a command-line interface for users to interact with their computers, allowing them to run programs, manage files, and perform various tasks. OpenDOS aims to maintain compatibility with existing DOS applications while offering enhancements and improvements. The project is part of a broader movement to preserve and promote legacy software, making it accessible for modern users. OpenDOS can be used on various hardware platforms and is often favored by enthusiasts and developers who appreciate its simplicity and efficiency in managing system resources.