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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.
Re: What are the main type of system software? System software is computer software designed to operate and control the computer hardware and provides an architecture for running application software. System software can be divided into two types, operating systems and software utilities.