What is a reset CSS file used for?

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Tags

1. #short
2. #agent
3. #stylesheet
4. #websites
5. #browser
6. #unstyled
7. #resets
8. #compressed
9. #minified
10. #often
11. #appear
12. #every
13. #legible
14. #rules
15. #elements
16. #consistent
17. #default
18. #baseline
19. #styling
20. #reset