An operating system (OS) is the most important software on a computer. It manages the hardware, runs applications and provides the interface you use every day.

What is an operating system
An operating system manages the computer and runs programs.

What an Operating System Does

  • Manages hardware: Controls the CPU, memory and devices.
  • Runs programs: Lets applications use the computer's resources.
  • Manages files: Organises files and folders on storage.
  • Provides an interface: The desktop, icons and windows you see.

Popular Operating Systems

  • Windows: The most widely used OS on personal computers.
  • Linux: Free and open-source, popular on servers.
  • macOS: Apple's operating system for Mac computers.
  • Android and iOS: Operating systems for mobile phones.

Why It Matters

Without an operating system, a computer cannot work. Learning how an OS works is the first step to understanding computers.

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