What do classes mean on SD cards?

Related questions

1. Will SDXC work in SDHC slot?
2. What is UHS 3 memory card?
3. How fast is a Class 10 SD card?
4. Are all SD cards the same?
5. What does u3 mean on SD cards?
6. Is UHS 1 the same as Class 10?
7. Is SDHC faster than Sdxc?
8. Which is better UHS 1 or UHS 3?
9. What's better SanDisk Ultra or extreme?
10. What is class in micro SD card?

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7. #guidelines
8. #association
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14. #suitable
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19. #different
20. #provide
21. #there
22. #recording
23. #defines