What does thumbnail size mean?

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Tags

1. #which
2. #thumbnail
3. #pixels
4. #digital
5. #however
6. #small
7. #larger
8. #ratio
9. #aspect
10. #represents
11. #images
12. #75x75
13. #200x200
14. #rectangular
15. #150x100
16. #between
17. #screen
18. #widely
19. #image
20. #displayed
21. #usually
22. #thumbnails
23. #describe