What are the different types of OS?

These are the different types of OS.

Multi User – Allows two or more users to run programs at the same time. Some operating systems permit hundreds or even thousands of concurrent users.

Multi processing – Supports running a program on more than one CPU.

Multi tasking  Allows more than one program to run concurrently.

Multi threading  Allows different parts of a single program to run concurrently.

Real time – Responds to input instantly. General-purpose operating systems, such as DOS and UNIX, are not real-time.

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