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  1. Operating system - Wikipedia

  2. What is an Operating System? - GeeksforGeeks

  3. Operating System Tutorial - GeeksforGeeks

  4. Operating system (OS) | Definition, Examples, & Concepts ...

  5. 5 Types of Operating Systems to Know - Coursera

  6. Computer Basics: Understanding Operating Systems

  7. What is Operating System (OS)? Defintion and Functions ...

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