The operating system is a program the runs the computer.
The operating system is the one and only program that talks to the computer’s hardware
The operating system maintains the file system.
The operating system knows every piece of hardware and how it works.
The operating system can have many processes running at the same time.
The operating system is responsible for cataloging and recording every program and all data on the computers data storage system.
The graphic user interface is largest and most complex application running on the computer.
The operating system acts like the software layer that sits between the computer and hardware and the other computer applications.
Windows, OS-X, and Linux do a good job of turning a lump of electronic machinery into a very good office or school tool. `