About 18,400,000 results
Which version of Windows operating system am I running?
Operating system - Wikipedia
Operating System (OS) Definition & Examples - Lifewire
What is an Operating System (OS)? Definition, Types and Examples
What is an Operating System? - How-To Geek
What is an Operating System? - GeeksforGeeks
Operating system (OS) | Definition, Examples, & Concepts
Computer Basics: Understanding Operating Systems
What Is an Operating System (OS)? Types, Functions, and More
What Is an Operating System? | Coursera