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Which version of Windows operating system am I running?
Operating system - Wikipedia
What is an Operating System? - How-To Geek
Operating System (OS) Definition & Examples - Lifewire
What is an Operating System (OS)? Definition, Types and Examples
Operating System Tutorial - GeeksforGeeks
Operating system (OS) | Definition, Examples, & Concepts
Operating System Definition - What is an operating system?
Introduction to Operating Systems - YouTube
The Best Operating Systems: Windows, macOS, Linux, or ChromeOS ... - PCMag