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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.
System software is the most popular and the most used software out of all three. System software also offers you a protective cover for all the other software and it also gives support to some of the hardware parts of the computer like keyboard and printers. The programming software is a must use for programmers.