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Operating system - Wikipedia
What is an Operating System (OS)? Definition, Types and Examples
Operating System (OS) Definition & Examples - Lifewire
The Best Operating Systems: Windows, macOS, Linux, or ChromeOS ... - PCMag
What is an Operating System? - GeeksforGeeks
Operating system (OS) | Definition, Examples, & Concepts
What is an Operating System? - How-To Geek
What Is an Operating System (OS)? Types, Functions, and More - G2
What Is an Operating System? | Coursera
Operating System Tutorial - GeeksforGeeks