Most operating systems native to the computer system allows users to communicate with the computer system
user interface
the operating system.
interface
It is called the user interface.
Interface
The operating system is that expert software that allows the computer operator to feed in instructions to the computer. It governs how the installed software will run.
the operating system
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It's blurred (intentionally, by Microsoft). An operating system is the program that allows the computer to communicate with all its parts. Windows is a GUI (graphic user interface) that "allows" humans to operate a computer. Believe it or not, under the pretty pictures, (and that long pause after you turn it on), your computer is still running DOS (or MSDOS : Microsoft disk operating system)
a system that allows direct communications between user and computer - 2 misses
The file system.
Operating system and utility software help the user communicate with computer hardware. They achieve this by providing a user interface and interpreting user instructions for the hardware.