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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.
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.