What does the term OS stand for in computing?

The term OS in computing stands for Operating System. An operating system is software that acts as an intermediary between computer hardware and the user. It manages hardware resources, facilitates user interaction with the system, and provides a platform for running applications. Examples of operating systems include Microsoft Windows, macOS, Linux, and Android. Understanding this term is fundamental to grasping how computers function, as the OS is essential for coordinating all tasks across the hardware.

While other options represent important concepts in computing—such as online security measures, data management through object storage, and the principles behind open-source software—they do not define the overarching framework within which computers operate, as the operating system does. Therefore, "Operating System" is the accurate representation of what OS signifies in this context.