System commands are instructions given to a computer's operating system to perform specific tasks. These commands can be used to manage files, run programs, or configure system settings. Users typically enter these commands through a command-line interface, such as the Windows Command Prompt or Linux Terminal. Each system command has a specific syntax and can include options or parameters to modify its behavior. For example, the mkdir command creates a new directory, while the ls command lists files in a directory. Understanding system commands is essential for effective computer management and troubleshooting.