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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.
Software refers to the programs that you use on your computer (like a word-processing program) or the programs that make your computer work (you physically cannot touch these). Programs are also called applications. CPU (Central Processing Unit): This box is the brain of a computer system.