What is the purpose of a zero fret on a guitar?

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Tags

1. #guitar
2. #having
3. #other
4. #positioned
5. #serves
6. #located
7. #higher
8. #spaced
9. #function
10. #behind
11. #which
12. #properly
13. #occupied
14. #solely
15. #normally
16. #frets
17. #strings
18. #location