Final answer:
The tool used to manage user accounts in Windows OS is 'Computer Management'. It allows you to add, edit, or remove users by navigating to Local Users and Groups within the utility.
Step-by-step explanation:
In the Windows operating system, the tool that is used to add/edit/remove users on a computer is known as Computer Management. This utility provides access to a variety of system administration tools, including Local Users and Groups, where you can manage user accounts. To reach it, you can right-click on the This PC or My Computer icon on the desktop and select Manage, or you can type Computer Management into the search box on the taskbar and select the app that appears.
Once you have opened Computer Management, navigate to the Local Users and Groups section, and there you will find options to add new users, change existing user account properties, or remove users, as needed. It's important for administrators to know how to handle user accounts effectively to maintain system security and provide appropriate access rights to different users.