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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.
Though hardware and software are most often associated with computers, software also runs on other hardware, such as cell phones, Global Positioning Satellite (GPS) units, medical equipment, and air traffic control system. Without any type of software the computer would be useless.