An Operating System (OS) is not hardware; it is software that manages computer hardware and software resources. The OS provides an interface between the user and the computer hardware, enabling you to interact with the system and run applications.

Examples of operating systems include Windows, macOS, Linux, and Android.

Hardware, on the other hand, refers to the physical components of a computer system, such as the CPU, memory, storage devices, and input/output devices. The OS runs on hardware but is not considered hardware itself.