What does serif mean in fonts?

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Tags

1. #typography
2. #found
3. #obvious
4. #horizontal
5. #style
6. #refers
7. #typeface
8. #stroke
9. #letters
10. #strokes
11. #fonts
12. #vertical
13. #readability
14. #pronounced
15. #small
16. #others
17. #serifs
18. #serif
19. #subtle
20. #extra
21. #cases