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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).
Computers use low-level software called an operating system (O/S) to help people operate the physical machines. An O/S enables running application software (called programs) as well as building new programs. Operating system software runs not just on laptop computers but also on cell phones, network routers and other so-called embedded devices.