System software is the set of files and resources that the computer uses to run itself.
The components manage the memory, input and output devices and support how applications are used. All the components must be kept in the System Folder. The System File starts up the Mac and provides system-wide information. The System Files must reside in the System Folder. The System Folder contains the System File, Finder, printer drivers, scrapbook, clipboard and other resource files that support application programs.