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The word software is also sometimes used in a more narrow sense, meaning application software only. At the lowest level, executable code consists of machine language instructions specific to an individual processor âtypically a central processing unit (CPU).
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.