System-level software is the largest segment of the systems infrastructure industry and consists of operating systems (OS), utilities, and networking software. Operating systems are master programs that perform basic computer functions as well as act as underlying platforms for application programs. OS software is required for all computer platforms. The most common are Windows, Unix, and Macintosh. Utilities are programs that enhance a computer’s capabilities or perform support functions such as file management and file compression. more...
I think more information is needed for this topic, not fully compleate from my view.
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