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System software is computer software designed to operate the computer hardware to provide basic functionality and to provide a platform for running application software.
Refers to the operating system and all utility programs that manage computer resources at a low level.
The BIOS (basic input/output system) gets the computer system started after you turn it on and manages the data flow between the operating system and attached devices such as the hard disk, video adapter, keyboard, mouse, and printer
The boot program loads the operating system into the computer's main memory or random access memory (RAM).
System software also includes system utilities, such as the disk defragmenter and System Restore.