Command.com

Command.com is a core component of early Microsoft DOS and Windows operating systems, serving as a command-line interface that allows users to interact with their computer through text commands. It functions as a text-based navigator, enabling users to run programs, manage files and directories, and perform system tasks without a graphical user interface. Essentially, Command.com acts as the primary way users communicate with and control their PC using typed commands, which was especially important before modern graphical interfaces became standard.