How do I find out what my Mac operating system is?

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Tags

1. #macos
2. #window
3. #screen
4. #version
5. #operating
6. #about
7. #installed
8. #system
9. #apple
10. #which
11. #command
12. #select
13. #click
14. #corner
15. #number
16. #overview
17. #appears