The "Reboot Command" is a function used in computer systems to restart the operating system. This command can be executed through various interfaces, such as command line prompts or graphical user interfaces. When activated, it closes all running applications and processes, allowing the system to refresh and clear temporary files, which can improve performance. In many operating systems, including Windows, macOS, and Linux, the reboot command is essential for applying updates or resolving issues. Users can typically initiate a reboot by selecting options from the Start Menu or using keyboard shortcuts, making it a fundamental tool for system maintenance.