An operating system is a collection (or suite) of programs that manages and controls the computer. Operating systems have many functions: ...

The kernel plays an essential role, as it manages how your phone, tablet, and PC's hardware and operating system.

An operating system is the foundation of any computing system, controlling the input and output of data and ensuring that different programs and devices work together effectively. Examples of ...

The course covers nine areas, with the first six being core operating system functions and the remaining three covering more advanced operating system concepts.

I think the diagram is just trying to emphasize that operating system functions are usually invoked through a different mechanism then a simple library call.

The question we ask here is “are tasks or threads necessary in an operating system?” The short answer is that if time slicing is needed, they are absolutely necessary. However, time slicing is ...