Which of the following is not a computer operating system?
The correct answer is BIOS.
BIOS is not a computer operating system.
Important Points
- BIOS (basic input/output system)
- It is a program that is used by a computer's microprocessor to start the computer system after it is powered on.
- It also manages data flow between the computer's operating system (OS) and attached devices, such as the hard disk, video adapter, keyboard, mouse and printer.
Key Points
- The Unix
- A Unix family is a diverse group of operating systems, with sub-categories including System V, BSD, and Linux.
- The name "UNIX" is a trademark of The Open Group which licenses it for use with any operating system that has been shown to conform to their definitions.
- macOS
- It is an open core graphical operating system.
- It is developed, and marketed, and sold by Apple Inc.
- Microsoft Windows
- It is a family of proprietary operating systems designed by Microsoft Corporation.
- It is primarily targeted at Intel architecture based computers.
Additional Information
- Operating system
- An operating system (OS) is system software that manages computer hardware, software.
- An operating system is a large and complex system.
- OS system components include:
- File,
- Process,
- Memory,
- I/O device management.


