What type of operating system allows multiple users to use the computer resources simultaneously?

A multi-user operating system is designed to enable multiple users to access and use the computer resources at the same time. This kind of OS manages user accounts and ensures that each user can work simultaneously without interference, while maintaining security and resource allocation.

In a multi-user environment, the operating system manages tasks such as memory allocation, file management, and input/output (I/O) operations for each user, allowing them to run applications concurrently. Examples of multi-user operating systems include UNIX, Linux, and Windows Server, which provide the necessary infrastructure to support numerous users logging into the system remotely or locally, each having their own session.

This capability is essential for environments like universities, businesses, or data centers, where many individuals might need access to shared resources or applications simultaneously.