What is the use of Google Analytics code?

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1. #install
2. #those
3. #tracks
4. #analytics
5. #language
6. #visit
7. #small
8. #tracking
9. #coding
10. #google
11. #browser
12. #every
13. #viewers
14. #snippet
15. #javascript
16. #website
17. #pages
18. #unique