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Fig 1: a screenshot from a software application. Utility software is software such as anti-virus software, firewalls, disk defragmenters and so on which helps to maintain and protect the computer system but does not directly interface with the hardware.
Quick Answer. The most notable system software is the operating system that controls the PC; other types of system software include device drivers, system utilities, compilers, file management tools, assemblers and debuggers. System software is typically installed onto the computer during the installation of the operating system.