Operating systems and utility programs

System software consists of the programs that control or maintain the operations of the computer and its devices.An operating system(OS) is a set of programs containing instructions that work together to coordinate all the activities among computer hardware resources,An operating system includes various shut down options like Sleep mode saves any open documents and programs to RAM, turns off all unneeded functions, and then places the computer in a low-power state and Hibernate saves any open documents and programs to a hard disk before removing power from the computer.A user interface controls how you enter data and instructions and how information is displayed on the screen,With a graphical user interface (GUI), you interact with menus and visual images,With a command-line interface, a user uses the keyboard to enter data and instructions.