System file
A system file in computers is a critical computer file without which a computer system may not operate correctly. These files may come as part of the operating system, a third-party device driver or other sources. Microsoft Windows and MS-DOS mark their more valuable system files with a "system" attribute to protect them against accidental deletion. (Although the system attribute can be manually put on any arbitrary file; these files do not become system files.)
Specific example of system files include the files with /boot (the kernel itself), /usr/sbin (system utilities) and /usr/lib/modules (kernel device drivers
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