What kind of operating system is windows

Depends what you mean because Microsoft Corporation made to run person computers (PC) featuring the first graphical user interface (GUI) for IBM compatible PC. Windows itself would be the operating system it cannot run something inside it unless you have a virtual machine but that would be a software and not hardware. Question confuses me.

Windows OS, laptop package (OS) developed by Microsoft Corporation to run personal computers (PCs). that includes the primary graphical interface (GUI) for IBM-compatible PCs, the Windows OS before long dominated the computer market. some 90% of PCs run some version of Windows.