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What is an operating system?

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Quick answer

An operating system (OS) is the core software that manages a computer's hardware and runs your programs. Windows, macOS, Android, and iOS are operating systems — the layer between you and the machine. It manages the CPU, memory, storage, and devices.

Key things to understand

  1. It manages the CPU, memory, storage, and devices.
  2. It lets multiple programs run at once and share resources fairly.
  3. It provides a consistent interface so apps don't talk to hardware directly.
  4. Examples: Windows, macOS, Linux, Android, iOS.

People also ask

What does an operating system do?
It manages hardware and resources, runs applications, and provides the interface between you and the computer.
What are examples of operating systems?
Windows, macOS, and Linux on computers; Android and iOS on phones.
Why do we need an operating system?
It lets programs run without each controlling the hardware directly, and shares resources safely among them.