DOS (Disk Operating System) is a family of operating systems, the most well-known being MS-DOS. It was dominant in the 1980s and early 1990s for IBM PC compatible computers. DOS is a single-tasking, single-user operating system that primarily uses a command-line interface. It manages disk storage, runs applications, and provides basic input/output services. It's commonly used for running older games and legacy software, and understanding its architecture provides insight into the evolution of modern operating systems.
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